Gumbel Distribution Function
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If Mn is the maximum of a sample of size n
from the exponential distribution E(1), then the distribution
of Mn - log(n) converges to the Gumbel(0,1) distribution.
The Gumbel(0,1) distribution has density on the whole real line.
f(x) = exp{-e-x-x}
and distribution function
F(x) = exp{-e-x}.
For example, Gumbel(0,0,1) = 1/e = .36788