The interpretation of retest scores is problematic because they are potentially affected by measurement and predictive bias, which impact construct validity, and because their size differs as a function of various factors. This paper investigates the construct stability of scores on a figural matrices test and models retest effects at the level of…

The score distributions of the two methods of administration described in the title revealed comparable means, standard deviations, and general shape of distribution. With respect to validity coefficients, no appreciable differences were found. (JKS)

The Peabody Picture Vocabulary Test-Revised (Dunn and Dunn) is described as a convenient, quick test, possessing improvements over the original. It measures a subject's receptive (hearing) vocabulary for Standard American English. However, the validity information for the test is less than adequate, since no validity studies are presented for it.…

Researchers sometimes need a statistical test of the hypothesis that two values of Cronbach's alpha reliability coefficient are equal. The situation may involve scores from two different measures administered to independent random samples or from the same measure administered to random samples from two different populations. Feldt derived a test…