Re: [R] Overdispersion with binomial distribution

2009-02-17 Thread Ben Bolker
Thanks for the clarification. I actually had MASS open to that page while I was composing my reply but forgot to mention it (trying to do too many things at once) ... Ben Bolker Prof Brian Ripley wrote: > On Tue, 17 Feb 2009, Ben Bolker wrote: > >> Jessica L Hite/hitejl/O/VCU vcu.edu> writ

Re: [R] Overdispersion with binomial distribution

2009-02-17 Thread Prof Brian Ripley
On Tue, 17 Feb 2009, Ben Bolker wrote: Jessica L Hite/hitejl/O/VCU vcu.edu> writes: I am attempting to run a glm with a binomial model to analyze proportion data. I have been following Crawley's book closely and am wondering if there is an accepted standard for how much is too much overdisper

Re: [R] Overdispersion with binomial distribution

2009-02-17 Thread Ben Bolker
Jessica L Hite/hitejl/O/VCU vcu.edu> writes: > I am attempting to run a glm with a binomial model to analyze proportion > data. > I have been following Crawley's book closely and am wondering if there is > an accepted standard for how much is too much overdispersion? (e.g. change > in AIC has an

[R] Overdispersion with binomial distribution

2009-02-16 Thread Jessica L Hite/hitejl/O/VCU
I am attempting to run a glm with a binomial model to analyze proportion data. I have been following Crawley's book closely and am wondering if there is an accepted standard for how much is too much overdispersion? (e.g. change in AIC has an accepted standard of 2). In the example, he fits sever