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Gompertz (Truncated Gumbel) Distribution¶
For x≥0 and c>0 . In JKB the two shape parameters b,a are reduced to the single shape-parameter c=b/a . As a is just a scale parameter when a≠0 . If a=0, the distribution reduces to the exponential distribution scaled by 1/b. Thus, the standard form is given as
f(x;c)=cexexp[−c(ex−1)]F(x;c)=1−exp[−c(ex−1)]G(q;c)=log[1−1clog(1−q)]
h[X]=1−log(c)−ecEi(1,c),
where
Ei(n,x)=∫∞1t−nexp(−xt)dt
Implementation: scipy.stats.gompertz