internal-consistency method

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June 29, 2026

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The internal-consistency method is a way to estimate the reliability of a test using only one administration of a single test form. This method involves dividing the test into two halves, typically by separating the odd-numbered items from the even-numbered items.1

The degree of agreement between the scores on these two halves is then calculated. This correlation coefficient is used to estimate the overall reliability of the entire test. Statistical formulas, such as the Spearman-Brown prophecy formula or Kuder-Richardson formulas, are used to adjust this estimate for the full test length. This approach is common in psychological and educational testing to ensure that a test measures consistently.1

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psychological testing
Primary characteristics of methods or instruments
Internal-consistency methods of estimating reliability require only one administration of a single form of a test. One method entails obtaining scores on separate halves of the test, usually the odd-numbered and the even-numbered items. The degree of correspondence (which is expressed numerically as a correlation…
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Internal-consistency methods of estimating reliability require only one administration of a single form of a test. One method entails obtaining scores on separate halves of the test, usually the odd-numbered and the even-numbered items. The degree of correspondence (which is expressed numerically as a correlation…
Read More