Descriptor
| Definitions | 1 |
| Mathematical Formulas | 1 |
| Mathematical Models | 1 |
| Test Theory | 1 |
| Test Validity | 1 |
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| Zimmerman, Donald W. | 1 |
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| Journal Articles | 1 |
| Reports - Research | 1 |
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Peer reviewedZimmerman, Donald W. – Educational and Psychological Measurement, 1983
A definition of test validity as the ratio of a covariance term to a variance term, analogous to the classical definition of test reliability, is proposed. When error scores on distinct tests are uncorrelated, the proposed definition coincides with the usual one, but it remains meaningful when error scores are correlated. (Author/BW)
Descriptors: Definitions, Mathematical Formulas, Mathematical Models, Test Theory
