A previous study indicated that the Wilcoxon W test showed a power advantage over the student's t-test when they were calculated on samples drawn from a common mixed-normal distribution. The present study investigates the effect of correcting for outliers in the mixed-normal samples. The results indicate that the t-test corrected for outliers shows a superior power curve to the Wilcoxon W.
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Jeffrey Lee Rasmussen (1985) studied this question.
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