chi2Inv(p, n) Returns the inverse cumulative distribution function (icdf) of the chi-square distribution with degrees of freedom nu, evaluated at the probability values in p. Goldstein approximation Parameters: p: float, probability n: float, degress of freedom source. Returns: float.
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v2 The V1 release was returning low quality output, this one matches the desired result as measured against Microsoft Excels functions CHISQ.INV and CHISQ.INV.RT Updated: chi2Inv(pin, deg, tail) Returns the inverse of the right-tailed or left-tailed probability of the chi-squared distribution. Parameters: pin: float, probability deg: float, degress of freedom. tail: string, tail, either "r" for right or "l" for left Returns: float.