You know how to compute the probability (r,p)NB y
that the negatively binomially distributed variable assumes the nonnegative integer value y , then compute the probability that it is less than or equal to, say, i.100 n=:+/\(r,p)NB i.100 A random number between 0 and 1 ?0 is greater than this number of these probabilities +/n<?0 so this computes a negatively binomially distributed random variable. OK? Thanks. Bo. Den 21:04 fredag den 4. april 2014 skrev Devon McCormick <devon...@gmail.com>: I'd like to encourage J versions of things like this but I don't think R >requires admin rights to install. > > >On Fri, Apr 4, 2014 at 2:57 PM, John Baker <bakerj...@gmail.com> wrote: > >> Thanks guys, >> >> Unfortunately I need the nonintegral version which I believe is a ratio of >> gamma funcions - I'll have to look it up. >> >> The R route is not viable for me unless R can be installed without admin >> rights. The last time I looked one of the R interfaces was COM based which >> requires registry entries. It's easier for me to write my own that go >> through all the bullshit required to install software on company machines. >> >> One of the pleasing reactions of the ever increasing levels of corporate >> software management paranoia is the development of install packages that no >> longer require elevated rights. J is a good example. With the exception of >> the COM server J can be dropped anywhere without filling out SOX forms. >> >> "The more you tighten your grip, Tarkin, the more star systems will slip >> through your ... spam filters" >> >> >> >> On Fri, Apr 4, 2014 at 12:32 PM, Brian Schott <schott.br...@gmail.com >> >wrote: >> >> > Do you only need integer values for the one parameter? >> > If so, there is a half page, 7 step, algorithm in my old copy of >> Fishman's >> > simulation text I can photocopy for you. He has two other algorithm that >> > require more complex computations such as Cauchy and Gamma and Poisson >> > variates. >> > >> > >> > >> > >> > -- >> > (B=) <-----my sig >> > Brian Schott >> > ---------------------------------------------------------------------- >> > For information about J forums see http://www.jsoftware.com/forums.htm >> > >> >> >> >> -- >> John D. Baker >> bakerj...@gmail.com >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> > > > >-- >Devon McCormick, CFA > >---------------------------------------------------------------------- >For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
