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CogAT Standard Age Scores

By Inderbir Kaur Sandhu, Ph.D


Q: How do I convert CogAT Standard Age Scores to composite scores?

My son's SAS scores for the CogAT were:
V 142
NV 142
Q 136

As far as I understand those scores correspond to a "stanine" of 9 (though I do not know exactly what that means), nor where we given percentiles scores. With the given information, can the composite score be calculated?

Thanks for your help.

A: The Standard Age Score (SAS) scale is a normalized standard score scale for each battery and composite. This is the composite score, which is calculated first from the raw scores to a Universal Standard Score (USS) and finally the SAS using a table (from the CogAT Form 7 Norms and Score Conversions Guide). The SAS has a mean of 100 and a standard deviation of 16.

For example, students who have an SAS of 100 on the Verbal Battery have a rate and level of development of verbal reasoning skills that is typical of their age group. A student who has an SAS of 125 on the Verbal Battery has a faster rate and a higher level of development of verbal reasoning skills than the typical student in the same age group. As per standard age scores, a very high score in CogAT is between 128 and 150, above average score is between 112 and 127, average score is between 89 and 111, below average score is between 73 and 88, and very low score is between 50 and 72. Your son scored in the very high range for all the batteries.

The stanine scale is a normalized standard score scale consisting of nine broad levels
designated by the numbers one through nine. Stanines are provided for both age and grade groups. Stanines are similar to percentile ranks, are relatively easy to use because they are all one-digit numbers. Normalized standard scores that range from 1 (lowest) to 9 (highest) and have an average value of 5. Your son's score is in the highest stanine. Hope that sheds some light. All the best.


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