Fisher Transformation

In statistics, hypotheses about the value of the population correlation coefficient ρ between variables X and Y can be tested using the Fisher transformation applied to the sample correlation coefficient r.

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    Children and old people and the parents in between should be able to live together, in order to learn how to die with grace, together. And I fear that this is purely utopian fantasy ...
    —M.F.K. Fisher (1908–1992)