[R] Under-dispersion - a stats question?

From: Martin Henry H. Stevens <HStevens_at_MUOhio.edu>
Date: Tue 11 Oct 2005 - 05:57:09 EST

Hello all:
I frequently have glm models in which the residual variance is much lower than the residual degrees of freedom (e.g. Res.Dev=30.5, Res.DF = 82). Is it appropriate for me to use a quasipoisson error distribution and test it with an F distribution? It seems to me that I could stand to gain a much-reduced standard error if I let the procedure estimate my dispersion factor (which is what I assume the quasi- distributions do).

Thank you for any input at all.


Dr. Martin Henry H. Stevens, Assistant Professor 338 Pearson Hall
Botany Department
Miami University
Oxford, OH 45056

Office: (513) 529-4206
Lab: (513) 529-4262
FAX: (513) 529-4243


"E Pluribus Unum"

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