Jaquard’s coefficient

When variables have binary (yes/no) values, a couple of issues come up when measuring distance or similarity between records.  One of them is the "yacht owner" problem.

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Darwin’s Legacy in Statistics

Charles Darwin, the most famous grandson of the Enlightenment thinker Erasmus Darwin, published his ground-breaking theory of evolution, “The Origin of Species,”160 years ago. Another grandson of Erasmus, Francis Galton, became one of the founding fathers of statistics (correlation, the “wisdom of the crowd,” regression…

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