LARGE-SCALE PREDICTOR VALIDATION IN PROJECT A: DATA COLLECTION PROCEDURES AND DATA BASE PREPARATION

The data base for the Army Selection and Classification Project (Project A) contains two major samples referred to as the concurrent validation sample and the longitudinal validation sample. The former was drawn from a cohort that joined the Army in 1983/84, and the latter from a cohort that entered in 1986/87. This paper describes the data base resulting from the concurrent sample. The sampling procedure, the distribution of sample sizes over jobs, the total array of variables, and the data collection procedures are described. Also discussed are the extensive data editing procedures that were used to deal with missing data.