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Hi all I have developed a zero-inflated negative binomial model using the zeroinfl function from the pscl package, which I have carried out model selection based on AIC and have used likelihood ratio tests (lrtest from the lmtest package...

Hi all I seem to have fallen at the first hurdle with my analysis, I have a set of binary disease outbreak data linked to a large number of landscape metrics variables and environmental variables which I would like to...

Hi I am using ridge regression as a method to over come the multicollinearity in my dataset and in order to select the lambda (ridge estimator/regularization parameter) I am generating a ridge trace using the following commands (using R...

Hi all I am hoping this is just a minor problem, I am trying to implement a best subsets regression procedure on some ecological datasets using the regsubsets function in the leaps package. The dataset contains 43 predictor variables plus...

Hi I am using R version 2.7.2. on a windows XP OS and have a question concerning an analysis of covariance with count data I am trying to do, I will give details of a scaled down version...