Seyed Reza Jafarzadeh <srjafarzadeh <at> gmail.com> writes: > > Hello, > > In WinBUGS 1.4 manual > (http://www.mrc-bsu.cam.ac.uk/bugs/winbugs/manual14.pdf), the gamma > density is presented as dgamma(r,mu) where r and mu are the shape and > rate parameters, respectively. In JAGS (rjags) manual version 1.0.2, > May 9, 2008 > (http://www-fis.iarc.fr/~martyn/software/jags/jags_user_manual.pdf), > on page 26 the gamma density is presented as dgamma(mu,r) instead of > dgamma(r,mu). Since JAGS uses the BUGS language, I was wondering if > this is a typo or it is in fact different from WinBUGS. >
I don't know, but I would suggest (1) trying a couple of little simulations to try it out for yourself -- for example with the following BUGS code mu <- 1 r <- 1 x ~ dgamma(mu,r) and see what the distribution looks like. and (2) e-mailing Martyn Plummer, the author (since it seems likely that this is a documentation bug, he probably would like to hear from you) Ben Bolker ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
