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Tests for difference between samples or groups

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Student's t test assumes normal distribution of samples, sign test assumes paired samples where values on the same input row form pairs. For t test the Meta.Numerics.dll presumes equal variance in both samples. Option Codes and values enables simultaneous U and t test for multiple samples and up to 255 variables. For Kruskal-Wallis test the input lines must be in columns as grouping code and values.
U test is sensitive to exactly equal values and different algorithms are used. See a comment from the meta-numerics team and a publication Bergmann et al 2000.
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