Test retest reliability psychology9/14/2023 ![]() ![]() The test-retest reliability is the most popular indicator of survey reliability.Ī shortcoming of the test-retest reliability is that the "practice effect" - respondents "learn" to answer the same questions in the first test and this affects their responses in the next test. Normally, values of the correlation 0.7.0.8 are considered as satisfactory or good. In reality, this is almost never the case - the scores produced by a respondent would vary if the test were carried out several times. In the ideal case, both scores coincide for each respondent and, hence, the correlation coefficient is 1.0. Then, the correlation coefficient between two sets of IQ-scores is a reasonable measure of the test-retest reliability of this test. The correlation coefficient between such two sets of responses is often used as a quantitative measure of the test-retest reliability.įor example, a group of respondents is tested for IQ scores: each respondent is tested twice - the two tests are, say, a month apart. The closer the results, the greater the test-retest reliability of the survey instrument. The test-retest reliability of a survey instrument, like a psychological test, is estimated by performing the same survey with the same respondents at different moments of time. ![]()
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