Test-retest reliability of the General Ability Measure for Adults

The lest stability for the General Ability Measure for Adults was examined for up to a 48-day interval (M=35 days, SD=5) for a sample of 52 college st udents, ages 19 to 51 years. The means for the Intelligence Quotient were 1 07 (SD= 11) and 115 (SD=11), with a test-retest Pearson correlation of .62. Stability estimates for the measure's subtests were .30 far Matching, 33 f or Analogies, .54 for Sequences, and .40 for Construction. Reliability coef ficients were lower than expected for Matching, Analogies, and Sequences su btests and much lower than chose reported in the rest manual. The mean scor es increased significantly on retest. Over-all, this study supported the li mited temporal stability of the General Ability Measure for Adults.