(Statistics); Sampling; *Selective Admission;

Beckman's correction for regression in selected samples for predictive validity studies was applied to a large data file on 7,984 law school applicants. Data included ethnic group, sex, socioeconomic status, undergraduate degree, school, scores on the Law School Admission Test (LSAT), writing ability, undergraduate grade point averas.e, and age. The final selection criteria were not known. Data on the 1,845 applicants who were accepted included year of entrance, sex, date of birth, undergraduate grade point average, grade point average for first year of law school, undergraduate college, LSAT score, writing ability, ethnic group, and age. The grade point average for the first year of law school was estimated and compared, with and without using Heckman's correction factor. Three different methods were used to choose the variables for student selection and grade prediction: (1) the same set of variables wer