Re: [R-sig-eco] Possion model for paired data

Hi Manuel, I would suggest to use the signed difference. This will be Skellam distribution with expected value mu1-mu2 (means of the two Poisson distr) and variance mu1+mu2. The skellam and vglm functions in the VGAM package can be used for a likelihood ratio test for equal means (see example(skel

[R-sig-eco] Possion model for paired data

Dear list memebers, Is there a way to do a paired t test but using a poisson model (for counts). Thank you very much in advance. Best, Manuel Spínola [[alternative HTML version deleted]] ___ R-sig-ecology mailing list R-sig-ecology@r-project.o