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Peer reviewedMalgady, Robert G.; Colon-Malgady, Gerardita – Educational and Psychological Measurement, 1991
The reliability of residual scores created in the analysis of covariance in pretest-posttest designs, adjusted for a singe covariate, is compared with that of simple difference scores as relevant parameters vary. Little gain in reliability is created by analysis of covariance, which also suffers from reliability problems. (SLD)
Descriptors: Analysis of Covariance, Comparative Analysis, Correlation, Equations (Mathematics)
Download full textKristof, Walter – 1971
We concern ourselves with the hypothesis that two variables have a perfect disattenuated correlation, hence measure the same trait except for errors of measurement. This hypothesis is equivalent to saying, within the adopted model, that true scores of two psychological tests satisfy a linear relation. Statistical tests of this hypothesis are…
Descriptors: Analysis of Covariance, Comparative Analysis, Correlation, Error of Measurement
