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Fisher:: (2 methods):
distribution()
inverse()
distribution($value) X-Ref |
FISHER. Returns the Fisher transformation at x. This transformation produces a function that is normally distributed rather than skewed. Use this function to perform hypothesis testing on the correlation coefficient. param: mixed $value Float value for which we want the probability return: array|float|string |
inverse($probability) X-Ref |
FISHERINV. Returns the inverse of the Fisher transformation. Use this transformation when analyzing correlations between ranges or arrays of data. If y = FISHER(x), then FISHERINV(y) = x. param: mixed $probability Float probability at which you want to evaluate the distribution return: array|float|string |