Derived from the Reynolds Intellectual Assessment Scales™(RIAS™), this brief screening measure helps you quickly identify individuals who need a more comprehensive intellectual assessment.
Two types of intelligence are measured
- The RIST comprises a verbal subtest (Guess What) and a nonverbal subtest (Odd-Item Out), which were selected from the RIAS using theoretical, empirical, and practical considerations.
- Guess What is a classic measure of crystallized intelligence, whereas Odd-Item Out shares characteristics with fluid intelligence.
- Both subtests have good psychometric properties and similarly good factor analytic and criterion-related validity evidence, and both can be efficiently administered and scored.
Results are psychometrically sound and easy to compare
- Percentile ranks, 90% and 95% confidence intervals, T scores, z scores, NCEs, and stanines are available. RIST norms are based on the RIAS normative sample of 2,438 individuals.
- For the RIST Index, the median reliability coefficient is .95, test-retest reliability is .84 (corrected for restriction of range), and the median SEM is 3.35. These data suggest that the RIST functions well as a first or second screening gate.
- The RIST Index is highly correlated with the FSIQs of the WAIS®-III (.67) and the WIAT® mathematics (.69), language (.67), and Total Composite (.66) scores.
- Within a clinical group analysis, individuals diagnosed with mental retardation or dementia had mean RIST Index scores in the mid-70s, indicating that the RIST can effectively differentiate between individuals with and without intellectual impairment.