Sunday, August 22, 2010

iPost: Advances in Data Analysis and Classification, Vol. 4, Issue 2 - New Issue Alert

For the quantoid readers at IQs Corner

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Sunday, August 22

Dear Valued Customer,
We are pleased to deliver your requested table of contents alert for Advances in Data Analysis and Classification.

Volume 4 Number 2-3 is now available on SpringerLink

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In this issue:
Preface
Special Issue on Robust Methods for Classification and Data Analysis
Author(s)Marco Riani, Andrea Cerioli & Peter J. Rousseeuw
DOI10.1007/s11634-010-0071-6
Online sinceAugust 06, 2010
Page85 - 87

Regular Article
A review of robust clustering methods
Author(s)Luis Angel García-Escudero, Alfonso Gordaliza, Carlos Matrán & Agustín Mayo-Iscar
DOI10.1007/s11634-010-0064-5
Online sinceJune 18, 2010
Page89 - 109

Regular Article
A simulation study to compare robust clustering methods based on mixtures
Author(s)Pietro Coretto & Christian Hennig
DOI10.1007/s11634-010-0065-4
Online sinceJune 26, 2010
Page111 - 135

Regular Article
The k-step spatial sign covariance matrix
Author(s)C. Croux, C. Dehon & A. Yadine
DOI10.1007/s11634-010-0062-7
Online sinceJune 11, 2010
Page137 - 150

Regular Article
Robust kernel principal component analysis and classification
Author(s)Michiel Debruyne & Tim Verdonck
DOI10.1007/s11634-010-0068-1
Online sinceJune 24, 2010
Page151 - 167

Regular Article
Optimal robust estimates using the Hellinger distance
Author(s)Alfio Marazzi & Victor J. Yohai
DOI10.1007/s11634-010-0061-8
Online sinceJune 04, 2010
Page169 - 179

Regular Article
Inference for robust canonical variate analysis
Author(s)Stefan Van Aelst & Gert Willems
DOI10.1007/s11634-010-0063-6
Online sinceJune 08, 2010
Page181 - 197

Regular Article
A review on consistency and robustness properties of support vector machines for heavy-tailed distributions
Author(s)Arnout Van Messem & Andreas Christmann
DOI10.1007/s11634-010-0067-2
Online sinceJune 19, 2010
Page199 - 220
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Friday, August 20, 2010

iPost: Auditory selective attention deficits found as problem for some military trainees

Interesting story on potential predictive validity of WJ III Auditory Discrimination test in the military. Story at link below.

[Conflict of interest note: I am a coauthor and have a royalty interest in the WJIII battery. ]

http://www.army.mil/-news/2010/08/13/43678-army-researchers-discover-auditory-processing-deficit-in-some-68d-students/


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Thursday, August 19, 2010

iPost: History of Psychology - Volume 13, Issue 3

Focus on Czech, Brazil, Spain and Italy 

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Begin forwarded message:

From: psycalert@apa.org
Date: August 19, 2010 11:39:16 AM CDT
To: iapsych@charter.net
Subject: History of Psychology - Volume 13, Issue 3

A new issue is available for the following Educational Publishing Foundation journal:

History of Psychology

2010  Volume 13, Issue 3 (Aug)

Ten years of Italian historiography of psychology: A field in progress.
Page 215-249
Ceccarelli, Glauco; Cimino, Guido; Foschi, Renato

Historiography of psychology in Brazil: Pioneer works, recent developments.
Page 250-276
Campos, Regina Helena de Freitas; Jacó-Vilela, Ana Maria; Massimi, Marina

Historiography of psychology in Spain: The last decade.
Page 277-308
Carpintero, Helio; Lafuente, Enrique; Quintana, José; Ruiz, Gabriel; Sáiz, Dolors; Sáiz, Milagros; Sánchez, Natividad

Historiography of Czech psychology.
Page 309-334
Hoskovcová, Simona; Hoskovec, Jiří; Plháková, Alena; Šebek, Michael; Švancara, Josef; Vobořil, Dalibor


An essay by Walter Benjamin.
Page 339-340
van der Veer, Renè

Tracking down some ancient baboons.
Page 340-341
Wulff, David M.

News.
Page 341-348
No authorship indicated


To edit your profile or discontinue receiving table of contents alerts, visit http://psycalert.apa.org or your MyPsycNET page on APA PsycNET.

iPost: Children's hierarchical spatial (Gv) analysis patterns by age

Citation

Database: PsycARTICLES
[First Posting]
Children's spatial analysis of hierarchical patterns: Construction and perception.
Vinter, Annie; Puspitawati, Ira; Witt, Arnaud
Developmental Psychology, Aug 16, 2010, No Pagination Specified. doi: 10.1037/a0020615

Abstract

  1. Two experiments were reported that aimed at investigating the development of spatial analysis of hierarchical patterns in children between 3 and 9 years of age. A total of 108 children participated in the drawing experiment, and 224 children were tested in a force-choice similarity judgment task. In both tasks, participants were exposed to consistent and inconsistent targets for short (300-ms) and long (3-s) durations. The drawing task showed that 3-year-old children either preferred to draw the local level or reproduced both levels in a nonintegrated manner. Coordination between the 2 processes started to emerge at 4 years of age, and 6-year-old children produced essentially correct integrated responses. The similarity judgment task confirmed that local processing dominated at 3 years of age. Preference for global processing appeared at 5 years of age, and it gained in strength later. Significant effects of stimulus consistency and stimulus duration were also found. In particular, the use of inconsistent patterns in the similarity judgment task revealed a phenomenon of local-to-global interference in the 3-year-olds. (PsycINFO Database Record (c) 2010 APA, all rights reserved)


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iPost: Quantoids corner: Decomposing model fit

Citation

Database: PsycARTICLES
[First Posting]
Decomposing model fit: Measurement vs. Theory in organizational research using latent variables.
O'Boyle, Ernest H.; Williams, Larry J.
Journal of Applied Psychology, Aug 16, 2010, No Pagination Specified. doi: 10.1037/a0020539

Abstract

  1. Goodness-of-fit indices have an important role in structural equation model evaluation. However, some studies (e.g., McDonald & Ho, 2002; Mulaik et al., 1989) have raised concerns that overall fit values primarily reflect the fit of the measurement model, and this allows significant misspecification among the latent variables to be masked. Using an approach analogous to Anderson and Gerbing's (1988) 2-step approach that isolates the measurement component of a composite model, we present the rationale and evidence for the root mean square error of approximation of the path component (RMSEA-P), a relatively new fit index that isolates the path component. We reviewed 5 of the top organizational behavior/human resources journals from 2001 to 2008 and identified 43 studies using structural equation modeling in which the overall composite model could be decomposed into its measurement and path components. The RMSEA-P for these studies generally showed unfavorable results, with many values failing to meet commonly accepted standards. Incorporating the RMSEA-P and its confidence interval into James, Mulaik, and Brett's (1982) framework for model testing, we provide evidence that many of the conclusions based upon the goodness of fit of the overall model may be inaccurate. We conclude with recommendations for how researchers can focus more attention on path models and latent variable relations and improve their model evaluation process. (PsycINFO Database Record (c) 2010 APA, all rights reserved)


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Wednesday, August 18, 2010

Research bytes 8-18-2010: Is emotional intelligence (EI) a valid construct distinct from Gc and Gf?

MacCann, C. (2010). Further examination of emotional intelligence as a standard intelligence: A latent variable analysis of fluid intelligence, crystallized intelligence, and emotional intelligence. Personality and Individual Differences, 49(5), 490-496.
 

Abstract

This study tests whether emotional intelligence (EI) is distinct from existing factors of intelligence after controlling for method factors in EI measurement. The relationship between EI, fluid intelligence (Gf), and crystallized intelligence (Gc) latent factors is examined in a sample of Australian undergraduates (N = 207). EI measures are all multiple-choice so as to control for response format, and the study also examines the effect of consensus scoring on the distinction of EI from Gf and Gc. Results show that EI forms a latent factor distinct from Gf and Gc, though strongly related to Gc, and that consensus scoring has only minor effects on the factor structure. EI and Gc factors show similar relationships with big five personality, relating only to Openness. Females tend to score higher on EI, whereas males tend to score higher on Gf and Gc. It is suggested that EI might be considered a different content domain for acquired knowledge than is typically examined by Gc tests, and may have different motivational pathways to development.
Article Outline

1. Introduction

1.1. Summary of hypotheses

2. Method

2.1. Participants
2.2. Materials

2.2.1. Situational Test of Emotional Understanding – short form (STEU)
2.2.2. Situational Test of Emotion Management – short form (STEM)
2.2.3. Blends and Changes test from the MEIS
2.2.4. Vocabulary test
2.2.5. Esoteric analogies
2.2.6. General knowledge
2.2.7. Letter series
2.2.8. Nonsense syllogisms
2.2.9. Letter counting
2.2.10. Five factor model of personality

3. Results

3.1. Reliability and descriptive statistics
3.2. Structural analyses

3.2.1. EFA

3.2.1.1. Intelligence tests scored dichotomously
3.2.1.2. Intelligence tests scored by consensus

3.2.2. CFA

3.2.2.1. Intelligence tests scored dichotomously
3.2.2.2. Intelligence tests scored by consensus

3.2.3. Hierarchical factor analysis

3.3. Personality correlates of Gf, Gc, and EI factors

4. Discussion

4.1. The effect of consensus scoring on factor structure
4.2. Limitations and future directions

5. General conclusion
Acknowledgements
References

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Hale et al (2010) expert consensus specific learning disabilities (SLD) LDQ article

At Brad Hale's request (he has been spending lots of time emailing people copies of this paper and he needs a break), the Hale et al. (2010) the final version of the expert consensus white paper on "Critical issues in response-to-intervention, comprehensive evaluation, and specific learning disabilities identification and intervention" published in Learning Disability Quarterly can now be accessed by clicking here.



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Tuesday, August 17, 2010

Reading fluency and reading LD/dyslexia: Guest post by John DeMann

The following is a guest blog post (previously called virtual scholars at this blog)  by John J. DeMann, NCSP, School Psychologist, North Allegheny School District John took advantage of my standing offer to readers of my blogs to receive a PDF copy of any article I mention in a research brief (or byte ) or any article that may be in a recent "IQs Corner Recent Literature of Interest" post.  I know that many practitioners do not have access to journals......so if a person volunteers to make a brief written post, I'm willing to send them a PDF copy of the article in exchange for the post.

This feature benefits all readers as the post is "added value and commentary" which then allows me to provide a link to the full article (via the "fair use doctrine"---esp. for educational purposes) for all to read.  So it is a win-win and "help your colleagues" type of exchange program.

John's post is very well written and provides a nice overview of the article along with some stimulating ideas and thoughts.  Thanks John.  His post is reproduced below "as is" (save any minor copy edits and or the adding or URL links by the blogmaster).  If you are considering a guest post, don't think your post has to be as long as John's.  Individual differences in guest posting is valued and recognized.

Recently, increased interest in reading fluency has emerged in both the professional literature and in applied practice. Oral reading fluency is typically the outcome variable by which response to intervention (RTI) models are evaluated, and is usually measured by a child's rate and accuracy (words correct/minute) when reading connected text. With the ubiquity of interventions targeting core phonological awareness deficits, attention has shifted to other cognitive variables that influence reading development beyond single-word reading and decoding difficulties. Although traditional assessment and definitions of dyslexia focus on single-word reading and decoding deficits, difficulty with reading fluency has been increasingly recognized as an important characteristic of dyslexics. For example, the recent reauthorization of the Individuals with Disability Education Improvement Act (IDEA, 2004) now recognizes reading fluency as one of the eight areas of specific learning disability. More recent conceptualizations of the term dyslexia also include references to fluency as an area of difficulty experiences by individuals with dyslexia. Further, the authors of the forthcoming revision to the Diagnostic and Statistical Manual of Mental Disorders (5th edition) are proposing a revised definition of dyslexia that includes difficulties in accuracy or fluency. This increased attention to fluency as an important aspect of reading may be the result of fluency being recognized as an important contributor to the overall goal of reading - comprehension. Reading fluency is essential for a child's academic success, as dysfluent reading is likely to significantly interfere with reading comprehension and thereby hamper the learning of content area knowledge. Although intervention research has established reading fluency's importance in developing overall reading skills, more work is needed to explore dyslexia characterized primarily by a lack of fluency and gain consensus regarding disability subtypes and cognitive components of fluency.

Meisinger et al.'s articleReading Fluency: implications for the assessment of children with reading disabilities (Annals of Dyslexia, 2010, 60, 1-17) establishes an argument for the importance of fluency as an overall indicator of reading ability, and stresses the importance of including standardized measures of fluency when conducting comprehensive assessments. In the current age of formative assessment and response-to-treatment models dominating the school psychology landscape, these authors argue that reliable and valid measures of fluency may be an overlooked aspect of assessment given the shortcomings of many assessment instruments. They argue that many common assessment instruments that measure reading skills include measures of word reading, decoding, and comprehension, but seldom include measures of reading fluency. Additionally, they point-out the inconsistency of how reading fluency is defined by various tests. For example, the Reading Fluency subtest from the Woodcock-Johnson Tests of Achievement - Third Edition (WJ-III ACH) measures an individual's ability to quickly read simple statements and decide whether they are accurate (i.e. includes comprehension), whereas other measures characterize fluency as an individual's ability quickly and accurately read larger blocks of text (e.g. GORT-4). Regardless of how fluency is measured, Meisinger et al. caution that the omission of fluency in the assessment of an individual's reading skills may have important implications for diagnostic decision making. They reference recent research that suggests word reading and reading fluency are distinct skills that each make unique contributions to an individuals reading comprehension. Therefore, evaluations that do not include measures of reading fluency may lead to erroneous or misleading conclusions regarding an individual's reading abilities.

As a result of this significant problem, Meisinger et al. chose to examine the diagnostic utility of reading fluency to identify children with reading disabilities by (a) determining whether there are children who have typically developing word identification and decoding skills but show specific deficits in reading fluency; (b) examine which cognitive features differentiate children with specific reading fluency deficits from struggling and normal readers, and (c) investigating whether the omission of reading fluency in the assessment of children would results in the under-identification of children with reading disabilities. The results of their study suggest:

* reading fluency measures are more sensitive in detecting reading problems than word reading measures
* it is essential to evaluate reading fluency when assessing children referred for reading difficulties; failure to do so may result in the under-identification of children with reading disabilities
* results support the identification of a subgroup of children who exhibit specific deficits in reading fluency without concordant deficits in single word reading in isolation or in decoding unknown words ("double-deficit" reading disability subtypes
* RAN is an underlying process that plays an important role in determining the rate at which children read connected text
* compared to children with normal reading skills, children with deficits in reading fluency were characterized by deficits in rapid naming speed but not in phonological processing

These results, as the authors suggest, have important implications for practitioners, suggesting that psycho-educational assessment that does not include measures of reading fluency is at risk of under-identifying children who would otherwise be classified as reading-disabled. These results also support the need for increased focus on intervention that leads to improved reading skills beyond the single-word level.

In review of this article, a few criticisms/caveats to consider: the authors indicate that a comprehensive, standardized test that measures word reading, decoding, fluency, and comprehension does not exist, making a cross-battery approach necessary to measure all variables in this study. Therefore, as the authors suggest, differences in test characteristics could account for the observed differences in performance on these measures. Although the WJ-III measures all aspects of reading used in their study, they chose to use a measure of fluency that aligns with more current definitions (e.g. National Reading Panel). It might be interesting to see how these tests choose to conceptualize fluency in future test revisions. The new WIAT-III (which wasn't released until after this study was submitted for review) defines fluency much like the GORT-4, and benefits from being a comprehensive, co-normed battery. A replication of this study using the WIAT-III norming sample could mitigate the sampling and testing error differences reported in this study, and determine whether these results generalize to a larger normative sample - the sample used in this study was selected from a largely white, clinic-referred sample of children previously diagnosed with a reading disability or suspected of having reading problems. Lastly, the authors suggest that their results should be replicated and expanded upon by exploring other potentially important variables that may contribute to reading fluency performance. For example, working memory is offered as another potentially important cognitive variable for reading fluency that could be included in this model to predict variance in reading fluency performance. Despite the evidence that demonstrates RAN is an underlying process that plays an important role in identifying reading difficulties, our understanding of why children with reading problems display these deficits is still limited. From a CHC perspective, RAN tasks share both cognitive speediness (Gs) and naming/retrieval (Glr) performance aspects; another question that remains as a result of this study is whether RAN deficits represent a more general slow speed of processing (Gs), or whether RAN deficits are related to slowness specific to letters/numbers that hampers the development of fluent reading.

It is apparent that reading fluency represents a largely under-studied area of reading research that may be a key area of assessment for children who experience reading problems. Most importantly, assessment practices that include standardized fluency measures may help differentiate intervention for students who experience difficulty developing fluency beyond word-identification skills.


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iPost: Developmental Cognitive Neuroscience

Neuroscience News from Elsevier
A new journal for cognitive, affective and social developmental neuroscience. Now accepting submissions.
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Monday, August 16, 2010

Research brief 8-16-10: More Flynn Effect research--memory test study

A new Flynn Effect research study. Will be added to the next update of the on-line Flynn Effect archive.

Baxendale, S. (2010). The Flynn effect and memory function. Journal of Clinical and Experimental Neuropsychology, 32(7), 699-703.

The Flynn effect refers to the steady increase in IQ that appears to date back at least to the inception of modern-day IQ tests. This study examined the possible Flynn effects on clinical memory tests involving the learning and recall of verbal and nonverbal material. Comparisons of the age-related norms on the list learning and design learning tasks from the Adult Memory and Information Processing Battery (AMIPB), published in 1985, and its successor, the BIRT (Brain Injury Rehabilitation Trust) Memory and Information Processing Battery (BMIPB) published in 2007, indicate that there is a significant Flynn effect on tests of memory function. This effect appears to be material specific with statistically significant improvements in all scores on tests involving the learning and recall of visual material in every age range evident over a 22-year period. Verbal memory abilities appear to be relatively stable with no significant differences between the scores in the majority of age ranges. The ramifications for the clinical interpretation of these tests are discussed.

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Off task: Happiness is an optimized hard drive :)

Friday, August 13, 2010

First commandment of neuropsychological assessment

"If one writes a book on neuropsychological assessment, thou shall not write a book that is less than 3 inches thick or less than 3 lbs in weight"

Just kidding.  These are excellent and very informative books.  It just takes a toll on ones arms to lug these around when trying to do some reading and writing related to NP assessment :)

Brain plasticity and FACEBOOK

Monday, August 09, 2010

Institute for Applied Psychometrics (IAP) internet resourcs (web, blogs, etc.) updated/revised

This blog, as well as my other two professional blogs, are activities of the Institute for Applied Psychometrics (IAP).  I'm pleased to announce that this past week I finally found the time to update/revise the IAP web page. 

Aside from updating content, the major revision was the integration and cross-linking of the IAP web page with my three professional blogs.  The web page serves more as the "mother" host of major static material while the three blogs are the IAP's mechanisms (along with Facebook, LinkedIN and Twitter---page links that are now also available at the revised web page) for immediate, dynamic presentation of material.  Collectively all of these internet portals work together to meet the goals of IAP (as outlined below).  The sources are now better integrated via the latest web page revision.  Enjoy

You can access the IAP web page via three methods:

Enjoy
The Institute for Applied Psychometrics (IAP) llc is a private research organization, founded by Kevin McGrew, devoted to the application of educational, psychological, measurement and statistical procedures to issues and problems in psychology, education, and human exceptionalities/disabilities.  The goal of IAP is to provide a bridge between psychological, measurement, and statistical theory/methods and applied practice in psychology, education and law.

IAP has particular research interests in: (a) theories and measurement of human intelligence, personal competence and adaptive behavior, (b) the application of psychological and educational measurement principles and techniques to the development and interpretation of psychological and educational assessment instruments, (c) the Cattell-Horn-Carroll (CHC) Theory of Cognitive Abilities, (d) narrowing the theory-practice gap in educational and psychological assessment, (c) the influence of non-cognitive (conative) characteristics on learning and human performance, (d) psychological assessment practices in the identification and classification of individuals with intellectual and learning disabilities and other exceptionalities, (e) the application of emerging neurotechnologies to learning and cognitive performance, and (f) psychometric issues related to the identification of individuals with intellectual disabilities in Atkins MR/ID death penalty cases.  The practical application of psychometrics to educational, psychological and legal problems is a unique IAP focus.

IAP has conducted research and provided consultation and training on:

  • Human ability measurement as per the Cattell-Horn-Carroll (CHC; Gf-Gc) Theory of Cognitive Abilities.
  • Achievement and cognitive ability test development and interpretation.
  • The practical application of IRT, multivariate statistics, and structural equation modeling (SEM) methods to educational and psychological issues and problems.
  • Research, development, and validation of models of human abilities and competence, particularly in the areas of multiple intelligence's, academic and cognitive skill development, personal competence, adaptive behavior, and community adjustment.
  • The development and measurement of educational and community outcomes for individuals with disabilities.
  • Secondary analysis of large-scale national databases.
  • The development and improvement of educational assessment practices for students with disabilities.
  • The development of strong programs of construct validity for educational and psychological assessment and measurement methods.
  • Recognizing the importance on non-cognitive (e.g., self-regulated learning strategies; self- efficacy; etc) student characteristics in academic learning.
  • Psychometric issues surrounding intelligence testing in federal Atkins MR/ID death penalty cases.
  • Scientific advice to neurotechnology companies (i.e., Interactive Metronome).
  • Education regarding applied psychometric topics.

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Saturday, August 07, 2010

iPost: Neuroticism and speed-accuracy tradeoff in self-paced speeded mental addition and comparison.

Journal of Individual Differences - Vol 31, Iss 2
Previous research suggests a relationship between neuroticism (N) and the speed-accuracy tradeoff in speeded performance: High-N individuals were observed performing less efficiently than low-N individuals and compensatorily overemphasizing response speed at the expense of accuracy. This study examined N-related performance differences in the serial mental addition and comparison task (SMACT) in 99 individuals, comparing several performance measures (i.e., response speed, accuracy, and variability), retest reliability, and practice effects. N was negatively correlated with mean reaction time but positively correlated with error percentage, indicating that high-N individuals tended to be faster but less accurate in their performance than low-N individuals. The strengthening of the relationship after practice demonstrated the reliability of the findings. There was, however, no relationship between N and distractibility (assessed via measures of reaction time variability). Our main findings are in line with the processing efficiency theory, extending the relationship between N and working style to sustained self-paced speeded mental addition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)
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Friday, August 06, 2010

IQs Corner Recent Literature of Interest 08-06-10

This weeks "recent literature of interest" is now available. Click here.

Information regarding this feature, its basis, and the reasons for type of references included in each weekly installment can be found in a prior post.

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Wednesday, August 04, 2010

A new Flynn Effect related article in Psych. Reports: CHC framework used to interpret

Just found this new article that presents data supporting a environmental cause of the Flynn effect (level of literacy).  This article will be added to the Atkins MR/ID Flynn Effect Archive when it is next updated.  Stay tuned.

What I particularly like about the article is the fact that the author conceptualizes, organizes, and interprets the research findings in the context of contemporary Cattell-Horn-Carroll (CHC) theory of intelligence....the theory I continue to advocate for as the best current psychometric taxonomy for understanding intelligence test performance.

Anyone who would like to get early access to a PDF copy of the article in EXCHANGE for a guest blog post at this blog, should contact the blogmaster at iap@earthlink.net


Marks, D. F. (2010). IQ VARIATIONS ACROSS TIME, RACE, AND NATIONALITY: AN ARTIFACT OF DIFFERENCES IN LITERACY SKILLS. Psychological Reports, 106(3), 643-664.

A body of data on IQ collected over 50 years has revealed that average population IQ varies across time, race, and nationality. An explanation for these differences may be that intelligence test performance requires literacy skills not present in all people to the same extent. In eight analyses, population mean full scale IQ and literacy scores yielded correlations ranging from .79 to .99. In cohort studies, significantly larger improvements in IQ occurred in the lower half of the IQ distribution, affecting the distribution variance and skewness in the predicted manner. In addition, three Verbal subscales on the WAIS show the largest Flynn effect sizes and all four Verbal subscales are among those showing the highest racial IQ differences. This pattern of findings supports the hypothesis that both secular and racial differences in intelligence test scores have an environmental explanation: secular and racial differences in IQ are an artifact of variation in literacy skills. These findings suggest that racial IQ distributions will converge if opportunities are equalized for different population groups to achieve the same high level of literacy skills. Social justice requires more effective implementation of policies and programs designed to eliminate inequities in IQ and literacy.


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Research Brief 7-4-10: Investigation of prediction bias in WISC-IV

Excellent article that shows how one form of empirically-defined test bias (differential prediction) should be pursued.

Konold, T. R., & Canivez, G. L. (2010). Differential Relationships Between WISC-IV and WIAT-II Scales: An Evaluation of Potentially Moderating Child Demographics. Educational and Psychological Measurement, 70(4), 613-627.

Considerable debate exists regarding the accuracy of intelligence tests with members of different groups. This study investigated differential predictive validity of the Wechsler Intelligence Scale for Children—Fourth Edition. Participants from the WISC-IV—WIAT-II standardization linking sample (N = 550) ranged in age from 6 through 16 years (M = 11.6, SD  = 3.2) and varied by the demographic variables of gender, race/ethnicity (Caucasian, African American, and Hispanic), and parent education level (8-11, 12, 13-15, and 16 years). Full Scale IQ and General Ability Index scores from the WISC-IV were used to predict scores on Mathematics, Oral Language, Reading, Written Language, and the total composite on the Wechsler Individual Achievement Test—Second Edition. Differences in prediction were evaluated between demographic subgroups via Potthoff’s technique. Of the 30 simultaneous tests, 25 revealed no statistically significant between group differences. The remaining statistically significant differences were found to have little practical or clinical influence when effect size estimates were considered. Results are discussed in the context of other ability measures that were previously investigated for differential validity as well as educational implications for clinicians.

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Tuesday, August 03, 2010

iPost: Listening comprehension, oral expression, reading comprehension, and written expression: Related yet unique language systems in grades 1, 3, 5, and 7.

Journal of Educational Psychology - Vol 102, Iss 2
Age-normed tests of listening comprehension, oral expression, reading comprehension, and written expression were administered in Grades 1 (n = 128), 3, and 5, or 3 (n = 113), 5, and 7. Confirmatory factor analyses compared 1- and 4-factor models at each grade level and supported a 4-factor model of language by ear, mouth, eye, and hand. Multiple regressions identified which of the 3 other language skills explained unique variance in each of the 4 language skill outcomes and provided additional evidence that language is not a single skill. Individuals' ipsative scores (amount that the standard score for age on each language measure deviated from individual's mean for all 4 measures) showed that 25% to 30% of individuals showed relative strengths or weaknesses (±1 SD) in specific language skills, but only 7% were stable across Grades 3 and 5. Findings are discussed in reference to (a) theoretical implications for idea comprehension and expression via language by ear, mouth, eye, and hand; and (b) educational applications of observed developmental and individual differences for general, special, and gifted education. (PsycINFO Database Record (c) 2010 APA, all rights reserved)
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iPost: Does growth rate in oral reading fluency matter in predicting reading comprehension achievement?

Journal of Educational Psychology - Vol 102, Iss 2
In this study, we examined the relationship of growth trajectories of oral reading fluency, vocabulary, phonological awareness, letter-naming fluency, and nonsense word reading fluency from 1st grade to 3rd grade with reading comprehension in 1st, 2nd, and 3rd grades. Data from 12,536 children who were followed from kindergarten to 3rd grade longitudinally were used. These children were administered Dynamic Indicators of Basic Early Literacy Skills subtests, Peabody Picture Vocabulary Test—Third Edition, and reading comprehension (Stanford Achievement Test, 10th ed.) tasks multiple times in each year. Students' initial status and rate of growth in each predictor within each grade were estimated using individual growth modeling. These estimates were then used as predictors in dominance regression analyses to examine relative contributions that the predictors made to the outcome: reading comprehension. Among the 1st-grade predictors, individual differences in growth rate in oral reading fluency in 1st grade, followed by vocabulary skills and the autoregressive effect of reading comprehension, made the most contribution to reading comprehension in 3rd grade. Among the 2nd- and 3rd-grade predictors, children's initial status in oral reading fluency had the strongest relationships with their reading comprehension skills in 3rd grade. (PsycINFO Database Record (c) 2010 APA, all rights reserved)
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iPost: Reading achievement across three language groups: Growth estimates for overall reading and reading subskills obtained with the Early Childhood Longitudinal Survey.

Journal of Educational Psychology - Vol 102, Iss 2
This study estimated normative reading trajectories for the population of English-proficient language minority students attending U.S. public elementary schools. Achievement of English-language learners (ELLs) was evaluated in terms of native English speakers' progress, and estimates were adjusted for the effects of socioeconomic status (SES). The ELL group was disaggregated into native Spanish speakers and native speakers of Asian languages. Multilevel latent variable growth modeling indicated that achievement trends of Asian-language ELLs are more similar to those of native English speakers than to those of Spanish ELL groups. Spanish ELLs had lower initial reading achievement than both Asian-language ELLs and native English speakers, and Asian students had higher initial achievement than did the native English speaking group. Additionally, Spanish ELLs had statistically significantly less growth over time than did Asian ELLs, with differences being most notable on reading evaluation–related tasks. Language-related differences in total reading were minimized when SES effects were specifically modeled, suggesting that SES may be the more significant factor explaining the lower achievement rates of English-proficient native Spanish speakers. (PsycINFO Database Record (c) 2010 APA, all rights reserved)
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Monday, August 02, 2010

IQs Corner Recent Literature of Interest 08-02-10

This weeks "recent literature of interest" is now available.  Click here to access.

Information regarding this feature, its basis, and the reasons for type of references included in each weekly installment can be found in a prior post.

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