On Sun, 2008-11-16 at 17:58 -0500, Sally Roman wrote: > Hi- I'm try to run a GAM with a Gamma distribution, but am getting an > error message that there are non positive values allowed for the gamma > family. I do not have any negative values for my response or explanatory > variables. > > cod.fall.gam2.kept<-gam(y~s(b,bs="cr",k=4)+s(e,bs="cr",k=4)+f+s(g,bs="cr",k=4),data=cod.fall,family=Gamma) > Error in eval(expr, envir, enclos) : > non-positive values not allowed for the gamma family
Non-negative is *not* non-positive. Do you have zero values in the response? This would cause the error you are getting. HTH G > > Thanks Sally > > > Sally Roman > Fisheries Technician > University of Massachusetts, SMAST > 200 Mill Rd., Fairhaven, MA 02719 > [EMAIL PROTECTED] > 508-910-6379 > > _______________________________________________ > R-sig-ecology mailing list > R-sig-ecology@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-ecology _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
