[R] simplifying a GLM-removing categorical variables

From: mariannej <marianne.james_at_abdn.ac.uk>
Date: Tue, 04 Mar 2008 03:56:28 -0800 (PST)


Thanks for reading this mesage!

I have created a GLM (using the quasipoisson family) and am now trying to simplify it. One of my explanatory variables is categorical (vegetation type, with 6 different levels). In the model, 5 of the 6 levels are significant and one is not.

How should I simplify my model? Do I need to take out the whole category
(i.e. all of vegetation type), or just the level that is not significant
(but how would I explain this biologically?)

Please spell out any anwers simply, I am new to R,

Thanks very much

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