Description: The CCAT is a battery divided into three subtests: Verbal Analogies (VA), Mathematical Problems (MP) and General Knowledge (GK) of respectively 42, 38 and 56 items. Each part measures a distinct ability, and once taken as a whole, these tasks give a reasonably good estimate of general crystallized intelligence and scholastic ability.

As a psychometric tool, the CCAT shows both excellent reliability and criterion-related-validity. Reliability of the full CCAT as checked by Spearman-Brown corrected Split-Half coefficient proved to be very highly satisfactory (.97). This ensures an acceptable measurement error (2.77 for the full scale index) and a fair stability of measurement. Furthermore, the Verbal Ability scale resulting from the addition of VA and GK subtests demonstrated sufficient level of reliability for being interpreted as an individual measure (.96).

Correlations shown by the CCAT Indexes with other measures are within the expectations. Validity of both the full and the verbal scales was confirmed by very high correlations with the Reynolds Intellectual Assessment Scales (RIAS) Verbal Index (.89). Moreover, the CCAT was closely related to the Scholastic Aptitude Test I (.87), and both the Wechsler Adult Intelligence Scale III (WAIS-III) Full Scale IQ (.92) and Verbal IQ (.89). In other words, the CCAT is an appropriate measure of one’s crystallized-educational processing likewise for predicting a wide range of cognitive functioning.

Norms have been established by comparing CCAT scales with RIAS VIX and WAIS-III FSIQ, VIQ. Then, RIAS VIX changes over years were used to adjust CCAT indexes and produce age-referenced norms. The CCAT is suitable for both adolescents and adults (up to 75 years old). The computerized version yields with a raw score for each subtest.

Nota bene: I’m constantly collecting data in order to perform further psychometric analyses on criterion related validity. Consequently, I’m looking for poeple who already took the reasoning tests of the SAT, the ACT and other tests such as the WAIS IQ scale. Thank you very much for your help!

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