Multivariate analysis of variance (MANOVA) is widely used in educational research to compare means on multiple dependent variables across groups. Researchers faced with the problem of missing data often use multiple imputation of values in place of the missing observations. This study compares the performance of 2 methods for combining p values in…

Factor analyses of the Wechsler Preschool and Primary Scale of Intelligence (WPPSI) was conducted. The random sample included 100 boys and 100 girls beginning at age four with increments of 6 months up to age 6 1/2. The intercorrelation matrix of the 11 WPPSI subtests at each of the age levels was factor analyzed, and the percent of common,…

Discusses four ubiquitous major sources of measurement error for individual intelligence scales. Argues that where these sources cannot be directly investigated, they should be estimated rather than ignored. Estimated the typical magnitude of error arising from each of content sampling, time sampling, scoring, and administration. (Author)