[R] generating overdispersed poisson & negative binomial data

[Mike Lonergan]

I would like to try a simple parametric bootstrap, but unfortunately
(stupidly?) my models are "overdispersed" gams & glms.

I'm hoping for a function that generates overdispersed poisson or negative
binomial data with a given mean, scale (& shape parameter).

The loose definition I'm using is overdispersed poisson produces integer
values with variance=const*mean & "looks like" a poisson, & simly for
overdispersed negative binomial - I am aware that odnb is a strange thing to
desire.

Maybe the "integer-valued" bit of my definition is unnecessary, which would
mean a simple scaling would suffice, but I don't know enough to decide on
this without testing.

Thanks,

Mike.


-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._