generating a gamma random variable

There is a way to simulate a gamma law of parameters a and b, based on
the standard method above (simplified) and the variation of the method
of rejection.

And there are source code and references for how R does it, yet another
different way, in src/nmath/rgamma.c

	-thomas

Thomas Lumley			Asst. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle

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