[Estimation of reliability and stability in the data where test-retest intervals change over subjects].
Models for the test-retest situation are proposed, in which an interval between a test and a retest changes over subjects. In the model of a single observed variable we assume that the true score of the variable changes as a Markovian process. We show that stability and reliability of a test can not be estimated separately in the ordinary test-retest model which assumes equal stability for subjects, but that they can be estimated separately with our model. In the model of a latent variable (factor) we assume various stabilities for the latent variable and the non-zero covariances of specific factors in a test and a retest. These models are applied to actual data, and stabilities and reliabilities of tests are estimated quantitatively.
Ogasawara
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H
Safety Psychology Laboratory, Railway Technical Research Institute, Tokyo.
D000328:Adult; D006801:Humans; D008297:Male; D008390:Markov Chains; D008875:Middle Aged; D015233:Models, Statistical; D011581:Psychological Tests; D015203:Reproducibility of Results