[R] inverse.gaussian, nbinom

[Chong Gu]

Two questions:

1. inverse.gaussian is up there as one of the glm families, but do
people ever use it?  There is no inverse.gaussian in the R
distribution family, and when I checked McCullagh & Nelder, it only
appeared twice in the book (according to subject index), once in the
table on p. 30 and once on p. 38 in a passing sentence.  Is there a
good reference on this distribution?

2. When I looked at the negative binomial documentation, I couldn't
quite get things match for the composite Poisson case.  It seems to me
that prob=1/(1+scale) instead of prob=scale/(1+scale), but I don't
trust myself on the algebra.  Can someone else please double check it?

Thanks.

Chong Gu
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