[R] link function
Hi everyone, I have a model which yields a qqnorm plot (residuals~fitted values) of a sigmoidal shape. I have been reading about link functions and leafing through Crawley, but I'm still not sure how to solve this. Perhaps family=quasi(power= is the best route? Any suggestions much appreciated. Simon Pickett PhD student Centre For Ecology and Conservation Tremough Campus University of Exeter in Cornwall TR109EZ Tel 01326371852 __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] link function for gaussian family
On Fri, 24 Jan 2003, Kazuki Miyamoto wrote: Dear All, Is it possible to apply log link to gaussian family in glm? Help file saids that the gaussian family has only one permissible link, identity. Similar descriptions are also in Modern Applied Statistics with S-plus. Well, no choice of link is allowed in S-PLUS (sic), the subject of the book you mention. The R help file for gaussian() is wrong, and I will correct it. inverse, log and identity links are allowed in the R code. This has been so since the current CVS file started in March 1998. But the application of log link to gaussian family seems to be valid in R. Note that it is quite possible for no MLE to exist in that case, so use with care: the symptom will be convergence problems, but they can occur even if there is a valid solution. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ [EMAIL PROTECTED] mailing list http://www.stat.math.ethz.ch/mailman/listinfo/r-help
[R] link function for gaussian family
Dear All, Is it possible to apply log link to gaussian family in glm? Help file saids that the gaussian family has only one permissible link, identity. Similar descriptions are also in Modern Applied Statistics with S-plus. But the application of log link to gaussian family seems to be valid in R. Thanks for any help. Sincerely, Kazuki Miyamoto * Kazuki Miyamoto (Ph. D.) Kansai Research Center, Forestry and Forest Products Research Institute, Nagaikyutaro 68, Momoyama, Kyoto 612-0855, Japan Tel: +81.75.611.1385 Fax: +81.75.611.1207 E-mail: [EMAIL PROTECTED] * __ [EMAIL PROTECTED] mailing list http://www.stat.math.ethz.ch/mailman/listinfo/r-help
