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subcanopy
2002 May 28
2
logit regression, test among groups
Dear all:
My logistic regression model includes one qualitative and one quantitative
predictor variable,
aes <- glm(p.a ~ spp * log(light), family=binomial(link=logit)),
where spp is abundance of 3 species and light is subcanopy light
availability varying from 0 1.
I want to test differences among levels of the quantitative variable at a
value of x other than the current log(light)=0.