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Table 3 Rejection rates (%) of the t- and WMW tests for data drawn from gamma distributions using 1000 subjects in each group

From: t-tests, non-parametric tests, and large studies—a paradox of statistical practice?

  WMW test   t-test
  Skewness   Skewness
Std.ratio 1.0 2.0 3.0 4.0   1.0 2.0 3.0 4.0
1.05 5.8 14.4 78.6 100   4.8 4.4 4.9 4.8
1.10 8.6 39.1 98.8 100   4.8 5.0 5.1 4.9
1.15 13.6 65.7 100 100   5.5 4.8 5.1 5.2
1.20 19.6 83.7 100 100   5.0 4.7 5.2 5.2
1.25 26.1 93.8 100 100   5.7 4.7 5.0 5.1
1.30 33.9 97.7 100 100   4.9 5.0 4.4 5.1
1.40 48.9 99.8 100 100   4.9 5.0 5.0 4.8
1.50 61.7 100 100 100   4.7 5.0 4.9 5.3