Comparison of Some Two-Sample Location Tests for Non-Normal Alternatives
非正态备择下若干两样本位置检验的比较AI 解读 ↓
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非正态备择下若干两样本位置检验的比较AI 解读 ↓
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Summary Small to moderate sample size performance of the two-sample χ2, Kolmogorov–Smirnov, Wilcoxon and F-tests of location is investigated in a class of non-normal distributions through Monte Carlo sampling. The class of distributions is that of mixtures of two normal distributions with different means and/or variances. The cases of mixtures considered represent part of the regions for types I, II, IV, VI and VII of the Pearson system of continuous distributions. The mixture distributions from which the samples are drawn differ only in means, and possess varying degrees of skewness and kurtosis. Based on the Monte Carlo results, the Wilcoxon and Kolmogorov–Smirnov tests generally have higher power than the F-test, except for near normal underlying distributions where the F-test is optimal. The power of the χ2 test is less than optimal except when the sample size is large.