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Applied Psychological Measurement, Vol. 32, No. 1, 27-44 (2008)
DOI: 10.1177/0146621607311576

Exploring Population Sensitivity of Linking Functions Across Three Law School Admission Test Administrations

Mei Liu

Educational Testing Service, mliu{at}ets.org

Holland

Educational Testing Service

The simplified version of the Dorans and Holland (2000) measure of population invariance, the root mean square difference (RMSD), is used to explore the degree of dependence of linking functions on the Law School Admission Test (LSAT) subpopulations defined by examinees' gender, ethnic background, geographic region, law school application status, and law school admission status. Equating parallel measures of equal reliability shows very little evidence of population dependence of equating functions. When linking parallel measures, the actual amount of reliability does not seem to be a significant factor for tests with sufficient reliability. Linking two nonstrictly parallel tests that measure the same construct results in less population sensitivity than linking two tests that measure different constructs. The latter linkage leads to substantial population dependence. Linking functions are the least invariant across the ethnic subpopulations. Differences in constructs seem to play a bigger role in population sensitivity of linking functions than do differences in reliability.

Key Words: Index terms: equating • test linking • population invariance • RMSD • reliability • constructs


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