On Nov 24, 2009, at 3:41 PM, djpren wrote:
I am looking for the correct commands to do the following things:
1. I have a binomial logistic regression model and i want to test for
overdispersion.
Under the teach a man to fish precept, ... try:
RSiteSearch("test over dispersion binomial models")
2. If I do indeed have overdispersion i need to then run a quasi-
binomial
model, but I'm not sure of the command.
?glm
# and follow the appropriate links
3. I can get the residuals of the model, but i need to then apply a
shapiro
wilk test to test them. Does anyone know the command for this?
RSiteSearch("shapiro-wilks") # not that people here recommend this
procedure
The overall flavor of these questions is "homework", so I'm
speculating that you may want to consult your instructors.
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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