Re: [R-sig-eco] GLM mixed model with quasibinomial family

2010-07-30 Thread Ben Bolker
[cc'ing back to r-sig-ecology] [Please keep sending replies to r-sig-ecology so that others may benefit from the conversation, and so that others can answer if I can't or am too busy (!)] I don't know what you mean by the "degree of fit to your data". Are you trying to do a goodness-of-fit t

Re: [R-sig-eco] GLM mixed model with quasibinomial family

2010-07-29 Thread Kingsford Jones
On Thu, Jul 29, 2010 at 10:07 AM, Javier Martinez wrote: > The question is, can I really use a > mixed model if I only have two cases per group? In general, yes. E.g., the matched pairs t-test is subsumed by the LMM. However, it sounds as though the plan is to fit many quasibinomial GLMMs to a

Re: [R-sig-eco] GLM mixed model with quasibinomial family

2010-07-29 Thread Javier Martinez
Thanks to all of you! I did know the e-mail by Bates, which is out of my understanding, but I did not know the wiki on mixed models and the manuscript by Bolker! My data are based on 2 temporal samples from 8 different sites. I use mixed models because I want to avoid pseudo-replication including t

Re: [R-sig-eco] GLM mixed model with quasibinomial family

2010-07-28 Thread Etienne Laliberté
Hi Javier, see: https://stat.ethz.ch/pipermail/r-help/2006-May/094765.html Cheers Etienne Le mercredi 28 juillet 2010 à 18:44 +0200, Javier Martinez a écrit : > Dear R-users, > > I am using the 'lmer' function from package 'lme4', looking for a > regression model which takes into account the

[R-sig-eco] GLM mixed model with quasibinomial family

2010-07-28 Thread Javier Martinez
Dear R-users, I am using the 'lmer' function from package 'lme4', looking for a regression model which takes into account the grouped nature of my data. I am using frequencies as the dependent variable and percentages as the independent one. After some reading I think I should use the 'quasibinomi