Re: [R] generalized linear model (glm) and "stepAIC"

2009-07-11 Thread Ben Bolker
Simone Santoro wrote: >> Simone Santoro wrote: >>> >>> I have 1! 2 response variables (species growth rates) and two >>> envir onmental factors that I want to test to find out a possible >>> relation. >>> >>> The sample size is quite small: (7>> species-case). >>> >>> I performed a Shapiro tes

Re: [R] generalized linear model (glm) and "stepAIC"

2009-07-11 Thread Simone Santoro
don't answer me again. I hope not to seem hypocrite (I'm not) but I'm very grateful to you. I promise to write again only for more pertinent questions. Best wishes > Date: Fri, 10 Jul 2009 17:45:50 -0700 > From: bol...@ufl.edu > To: r-help@r-project.org > Subject:

Re: [R] generalized linear model (glm) and "stepAIC"

2009-07-10 Thread Ben Bolker
If you possibly can, you should get some local statistical advice. There are a number of pitfalls involved in what you're doing. Frank Harrell's book is a good reference, but may be too advanced if you are a beginner. You are right on the edge of having too little data for what you want to do

[R] generalized linear model (glm) and "stepAIC"

2009-07-10 Thread Simone Santoro
Hi, I'm a very new user of R and I hope not to be too "basic" (I tried to find the answer to my questions by other ways but I was not able to). I have 12 response variables (species growth rates) and two environmental factors that I want to test to find out a possible relation. The sample s