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Fisher’s r to z transformation

a statistical procedure that converts a Pearson product-moment correlation coefficient to a standardized z score in order to assess whether the correlation is statistically different from zero. The test is useful in providing a normally distributed statistic (called the Fisher transformed value or Fisher’s z) that can be used in hypothesis testing or in forming a confidence interval. Also called Fisher transformation; Fisher z transformation; z transformation. [Ronald Aylmer Fisher]

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