Hi All (first timer here, be gentle!!)
I'm trying to extract the residual variance out of a glm with poisson data
to
conduct power and sample size to detect a change over years.
I have equal reps within year (for now).
Is the residual variance just the grand mean of the original count data, or
something trickier?
glm.Male_glm(M~year*strata,family=poisson,offset=dur)
levels(year)
[1] "2000" "2001"> levels(strata)
[1] "0-4" "4.1-8" "12.1-16"
"8.1-12"
Norm Good
Fisheries Biologist (Mathematician)
Southern Fisheries Centre
PO Box 76, Deception Bay Q 4508
telephone 3817 9588, fascimile 3817 9555
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