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On Theories of Association Karl Pearson, F.R.S., Karl Pearson, F.R.S. Search for other works by this author on: Oxford Academic Google Scholar David Heron, D.Sc. David Heron, D.Sc. Search for other works by this author on: Oxford Academic Google Scholar Biometrika, Volume 9, Issue 1-2, March 1913, Pages 159–315, https://doi.org/10.1093/biomet/9.1-2.159 Published: 01 March 1913
PEARSON et al. (Sat,) studied this question.