"Intelligent" intelligence testing with the WJ IV Tests of Cognitive Ability #4: Evaluating within-CHC domain test score differences

Recently the following was posted to the CHC listerv.

"While working on an assessment this morning, I found another example of Verbal Attention as a measure of Gwm being discordant from other measures of short-term and working memory: 

18 year old with high functioning autism and LD:
WAIS IV FSIQ = 84; WJ IV GIA = 81
WJ IV Verbal Attn - 91, Story Recall - 91, Vis Aud Learning - 76;
(Gc-73, Gf-94, Gv-121, Ga- 61, Gs-82)
WAIS-IV DSF-3, DSB - 7, DSS - 6, Arith - 4
CTOPP 2 Phonol Memory - 70; Rapid Naming - 52  

Thoughts on the Verbal Attention score of 91?"

A number of members provided some good responses.  I have been working on a response, and this is installment #1.  The rest of the response, which gets into substantive hypotheses about why Verbal Attention may differ from other Gwm test scores, is almost done and will be posted (hopefully) by the end of this week.

I apologize for not continuing my "Intelligent" intelligence testing series...it has been a long time since the last post in that series.  Just busy busy busy.

Enjoy

PS.   By clicking on the "in" icon in the lower right corner of the control pane, one can reach a site to download the slides.  For those who want a crisp clear set of the slides in PDF, click on this link.

"Intelligent" intelligence testing: Evaluating wihtin CHC domain test score differences from Kevin McGrew

How to evaluate the unusualness (base rate) of WJ IV cluster or test score differences: It is a pleasure to use the correct measure - A SlideShare presentation

The WJ IV provides two primary methods for comparing tests or cluster scores.  One is based on a predictive model (the variation and comparison procedures) and the other allows comparisons of SEM confidence bands, which takes into account each measures reliability.  A third method for comparing scores, one that takes into account the correlation between compared measures (ability cohesion model) is not provided, but is frequently used by assessment professionals.  The three types of score comparison methods are described and new information, via a "rule of thumb" summary slide and nomograph, are provided to allow WJ IV users to evaluate scores via all three methods.

A PDF copy of the key WJ IV base rate rule-of-thumb slide can be found here.

How to evaulate the unusualness (base rate) of WJ IV cluster or test score differences: It is a pleasure to use the correct measure from Kevin McGrew