[R-sig-eco] Unbalanced data and random effects

2013-10-16 Thread v_coudrain
Dear all, I performed a census of insects at different sites and measured there size. I would like to know if size is related to an environmental factor. I modelled the size as a fonction of the factor with site as a random variable to account for within-site variability. However I have strong

[R-sig-eco] Unbalanced data and random effects

2013-10-17 Thread v_coudrain
Thank you very much for these explanations. It is quite technical and I am not sure that I got it all, but I will try to find the book of Gelman&Hill to get more insight into shrinkage. I read the book of Zuur and as you said the topic is not extensively covered. __

Re: [R-sig-eco] Unbalanced data and random effects

2013-10-16 Thread Krzysztof Sakrejda
On Wed, Oct 16, 2013 at 6:41 AM, wrote: > Dear all, > > I performed a census of insects at different sites and measured there size. I > would like to know if size is related to an environmental factor. I modelled > the size as a > fonction of the factor with site as a random variable to account

Re: [R-sig-eco] Unbalanced data and random effects

2013-10-16 Thread Chris Howden
nts should use their own judgement. -Original Message- From: r-sig-ecology-boun...@r-project.org [mailto:r-sig-ecology-boun...@r-project.org] On Behalf Of Krzysztof Sakrejda Sent: Thursday, 17 October 2013 12:29 AM Cc: r-sig-ecology@r-project.org Subject: Re: [R-sig-eco] Unbalanced data an

Re: [R-sig-eco] Unbalanced data and random effects

2013-10-16 Thread Krzysztof Sakrejda
gt; important predictors were not included in the data sent to us. Information > provided by us should not be solely relied upon when making decisions and > clients should use their own judgement. > > > -Original Message- > From: r-sig-ecology-boun...@r-project.org > [mailto:r-si

Re: [R-sig-eco] Unbalanced data and random effects

2013-10-16 Thread Chris Howden
le that > some important predictors were not included in the data sent to us. > Information provided by us should not be solely relied upon when > making decisions and clients should use their own judgement. > > > -Original Message- > From: r-sig-ecology-boun...@r-pro