Add confidence interval for MWU

[kschuerholt]

#225 Implemented CI from 'Calculating confidence intervals for some non-parametric analyses', Campbell and Gardner 1988. CI Style is adapted from ttest. The same publication offers a solution for wilcoxon, which is not yet implemented but could be added fairly easily.

[codecov[bot]]

Codecov Report

Merging #226 (f31b2e5) into master (b1c334d) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #226   +/-   ##
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  Coverage   98.99%   99.00%           
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  Files          19       19           
  Lines        3290     3304   +14     
  Branches      527      531    +4     
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+ Hits         3257     3271   +14     
  Misses         17       17           
  Partials       16       16           

Impacted Files	Coverage Δ
pingouin/nonparametric.py	94.11% <100.00%> (+0.52%)	:arrow_up:

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[raphaelvallat]

Hi @kschuerholt,

FYI I have just released a minor release of Pingouin (https://github.com/raphaelvallat/pingouin/releases/tag/v0.5.1) to fix some urgent dependencies bugs. Could you please make sure to update the PR to the new master and solve any conflicts that may arise?

Thank you, Raphael

[kschuerholt]

Hi @raphaelvallat

Thanks for the heads-up. It's still on the todo list, but currently other things have to come first. I'm trying to get hold of an original source for CI computation of nonparametric tests. Or did you find something?

Cheers, Konstantin