[R-sig-eco] About data distribution model

2008-12-18 Thread mujeeb rahman
Hi I have soil fauna count data from 60 plots (locations) which comprise 15 different habitats (15 x 4). From each of the 60 plots i taken 4 soil monoliths (soil core of 25 x25 cm size) and counted all the fauna. it is sure that the data does not follow a normal distribution and we could do anova.

Re: [R-sig-eco] About data distribution model

2008-12-18 Thread FRANCISCO MAURO GUTIERREZ
Hi Mujeeb. I think that this paper could help you. It talk about distribution fitting, it is very clear and you can find an example of poisson's distribution fitting. cran.r-project.org/doc/contrib/Ricci-distributions-en.pdf Franciso Mauro Gutierrez. Date: Thu, 18 Dec 2008 16:52:46

[R-sig-eco] Corrected AIC for binary response variables?

2008-12-18 Thread Landis, R Matthew
Greetings all, I'm using logistic regression to investigate mortality of trees. I'm using AIC to compare models, and I'm wondering if I should use AICc instead of AIC. Burnham and Anderson [1] recommend using AICc when n/K 40. But what do I consider for n? The logistic regression is

Re: [R-sig-eco] Corrected AIC for binary response variables?

2008-12-18 Thread Ben Bolker
Landis, R Matthew wrote: Greetings all, I'm using logistic regression to investigate mortality of trees. I'm using AIC to compare models, and I'm wondering if I should use AICc instead of AIC. Burnham and Anderson [1] recommend using AICc when n/K 40. But what do I consider for n? The