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Differential Ability Scales (DAS)


Step-by-step Analysis

Step 2 in interpretation is examination of any GCA vs. Cluster differences. Are any of the Cluster scores statistically different from the GCA score and do these differences constitute a level of unusualness? The completed DAS Analysis Sheet indicates that both the 22-point difference between the GCA and the Nonverbal Reasoning scores and the 16-point difference between the GCA and the Spatial score are not only statistically significant but also are only expected to occur in small percentages (1% and 10% respectively) of the population. Because of this, examiners can feel confident that the GCA score itself is not a clear summary of Kate's abilities. While Kate was able to express her knowledge and understanding at an average level for her age through the use of verbal expression, her ability to perform tasks that involve spatial visualization was much better developed while her ability to utilize nonverbal, logical, sequential reasoning seems much less well developed.

Figure-5  CONSIDERATIONS OF GCA vs. CLUSTER DIFFERENCES

GCA vs

DIFF.

STATISTICALLY SIGNIFICANT

ABNORMAL

FREQUENCY (Table B.3. p. 291)

VERBAL:

3

Y / N

Y / N

in ____ % of the population.

NONVERBAL REASONING:

-22

Y / N

Y / N

in __1 _ % of the population.

SPATIAL:

16

Y / N

Y / N

in _10__ % of the population.

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Case Study, p.  3