The ZIP model can be fitted with Jim Lindsey's function fmr from his gnlm library, see:
http://popgen0146uns50.unimaas.nl/~jlindsey/rcode.html Bendix Carstensen ---------------------- Bendix Carstensen Senior Statistician Steno Diabetes Center Niels Steensens Vej 2 DK-2820 Gentofte Denmark tel: +45 44 43 87 38 mob: +45 30 75 87 38 fax: +45 44 43 07 06 [EMAIL PROTECTED] www.biostat.ku.dk/~bxc ---------------------- > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Gregor GORJANC > Sent: Friday, January 21, 2005 1:05 PM > To: [EMAIL PROTECTED]; r-help@stat.math.ethz.ch > Subject: RE: [R] glm and percentage data with many zero values > > > A hint. > > You might try with ZIP i.e. zero inflated poisson model. I > did not used it, > but I have such data to work on. So if there is anyone hwo > can point how to > do this in R - please. There is also a classs of ZINB or > something like > that for zero inflated negative binomial models. > > Actually I just went on web and found a book from Simonoff "Analyzing > Categorical Data" and there are some examples in it for ZIP > et al. Look > examples for sections 4.5 and 5.4 > http://www.stern.nyu.edu/~jsimonof/AnalCatData/Splus/analcatdata.s http://www.stern.nyu.edu/~jsimonof/AnalCatData/Splus/functions.s -- Lep pozdrav / With regards, Gregor GORJANC --------------------------------------------------------------- University of Ljubljana Biotechnical Faculty URI: http://www.bfro.uni-lj.si Zootechnical Department mail: gregor.gorjanc <at> bfro.uni-lj.si Groblje 3 tel: +386 (0)1 72 17 861 SI-1230 Domzale fax: +386 (0)1 72 17 888 Slovenia ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html