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The intercept is the estimated log mean of the fitted gamma distribution, so that the mean life of the parts is The SCALE parameter used in PROC GENMOD is the inverse of the gamma dispersion parameter ...
You can use the options listed in Table 2.1 to superimpose a fitted theoretical distribution function on your cdf plot. EXPONENTIAL(exponential-options) plots one-parameter exponential distribution ...
SIAM Journal on Applied Mathematics, Vol. 18, No. 4 (Jun., 1970), pp. 721-737 (17 pages) The probability density functions of products of independent beta, gamma and central Gaussian random variables ...