![]() ![]() This is the Spearman-Brown prophecy formula.Then we can compute the reliability of scores on the total test. ![]() For example, you obtained the correlation between two-halves is.The correlation between two separate half-length tests is used to estimate the reliability. The administration of the tests can be counterbalanced to minimize the variation due to environmental factors.Ĭorrelation between two forms is used as the reliability index. essay types) or corresponding questions at the same difficulty level. For instance, having same set of domains, or same types of questions (multiple-choice vs. Parallel/Alternative/Equivalent forms should be built based on the same test specifications but contain different items. Kendall’s tau (non-parametric when variables are at least ordinal).Spearman’s rho (non-parametric when data are not normal).Pearson correlation can be used if assumptions are met.The correlation between two sets of scores is used as the reliability index: However, it raises concerns for educational testing which is the practice effect. ![]() Some conditions need to be fulfilled in the repetition of measurement, such as same location repetition over a short period of time same administration procedures.
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