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Applied Psychological Measurement
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Validity Generalization and Situational Specificity: An Analysis of the Prediction of First—Year Grades in Law School

Robert L. Linn

University of Illinois at Urbana-Champaign

Delwyn L. Harnisch

University of Illinois at Urbana-Champaign

Stephen B. Dunbar

University of Illinois at Urbana-Champaign

Results from 726 validity studies were analyzed to determine the degree of validity generalization of the Law School Admission Test for predicting first- year grades in law school. Four validity generaliza tion procedures were used and their results com pared. As much as 70% of the variance in observed validity coefficients could be accounted for by dif ferences in the within-study variability of LSAT scores, simple sampling error, and between-study differences in criterion reliability. The 90% credibil ity value for the true validities was estimated to be .45, and the average true validity was estimated to be .54. Despite the substantial degree of validity generalization, law school and the year the study was conducted explained significant portions of the residual variance in validities. Thus, some degree of situational specificity of validity remained.

Applied Psychological Measurement, Vol. 5, No. 3, 281-289 (1981)
DOI: 10.1177/014662168100500301
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