[R] Inverse Gaussian distribution

[Chong Gu]

I needed to generate some data from the Inverse Gaussian distribution
but it is not in R.  A google search took me to 

    http://www.maths.uq.edu.au/~gks/s/invgauss.html

which contains the documentation for the d, p, r, q functions with a
download link of the functions.  The functions work fine in R.

I am curious why the facilities are not included in R.  Is it for
legal reasons or just the lack or demand?

Chong
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