https://www.selleckchem.com/pr....oducts/pnd-1186-vs-4
When a person takes alternative forms of the same test across ****tions of the testing procedure, the test taker's observed scores on the alternative forms are rarely identical. In educational and psychological measurement, inconsistencies in a test taker's scores that are irrelevant to the construct being measured are attributed to errors of measurement. Typically, errors of measurement are summarized as the standard deviation of a test taker's observed scores over ****tion of the same testing procedure. Assuming that er
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