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Just a note

k = W(α/2) − [nA (nA − 1)] / 2 where:

  • k is the required number of differences from each end of the array to obtain the upper and lower confidence limits,
  • W(α/2) is the quantile of the Wilcoxon test statistic for NA and NB observations. Hence for a 95% confidence interval, look up W in Table A7 in Conover for 8 and 17 observations at P = 0.025.
  • nA and nB are the number of observations in groups A and B respectively.