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Journal Article NOTES ON THE HISTORY OF CORRELATION Get access KARL PEARSON, F.R.S. KARL PEARSON, F.R.S. Search for other works by this author on: Oxford Academic Google Scholar Biometrika, Volume 13, Issue 1, October 1920, Pages 25–45, https://doi.org/10.1093/biomet/13.1.25 Published: 01 October 1920
Karl Pearson (1920) studied this question.