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Differential Ability Scales (DAS)


Step-by-step Analysis

Between-Cluster differences are next examined (Figure-6). Kate was found to have statistically significant and unusual differences between her Verbal and Nonverbal Reasoning scores as well as between her Nonverbal Reasoning and Spatial scores. Both differences are expected to occur in only about 1 to 5% of the population. These large and unusual differences suggest that Kate displays her cognitive abilities in very different ways. Interpretation of Kate's abilities will most likely concentrate on these large cognitive cluster differences. These finding support those of Step 1. The GCA appears to be an inadequate way to try to describe Kate's abilities.

Figure-6 DETERMINING BETWEEN-CLUSTER DIFFERENCES

Cluster vs. Cluster

DIFF.

STATISTICALLY SIGNIFICANT

ABNORMAL

FREQUENCY (Table B.3. p. 291)

V vs. NvR :

25

Y / N

Y / N

in __5__ % of the population.

V vs. SP:

13

Y / N

Y / N

in ____ % of the population.

NvR vs. SP:

38

Y / N

Y / N

in __1__ % of the population.

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Case Study, p. 4