Re: [R-sig-eco] deviance as a goodness of fit in GLM

2014-07-22 Thread Bob O'Hara
On 21/07/14 19:52, Samantha PameLa wrote: Good day everybody, I'm a marine biologist student, working on my bachelor thesis and I'm stucked with a statistical doubt in the process, I hope someone here could help me. My thesis aims to understand which biological and environmental factors

Re: [R-sig-eco] deviance as a goodness of fit in GLM

2014-07-22 Thread Rui Coelho
Hi Samantha, Following what was already said before, you can also build your models by testing step-by-step which explanatory variables should be included, for example by using a Likelihood Ratio Test to compare each univariate model to the null model (intersect only). With that (determining

[R-sig-eco] deviance as a goodness of fit in GLM

2014-07-21 Thread Samantha PameLa
Good day everybody, I'm a marine biologist student, working on my bachelor thesis and I'm stucked with a statistical doubt in the process, I hope someone here could help me. My thesis aims to understand which biological and environmental factors influences the male aggressive rate of male

Re: [R-sig-eco] deviance as a goodness of fit in GLM

2014-07-21 Thread Pedro Pequeno
Hi Samantha, R2 is not a good measure for directly comparing alternative models because, among other things, it is also affected by the number of predictors in the model. Rather, you could use a measure such as the Akaike Information Criterion (AIC), which has been specifically designed for such