overdispersion and quasibinomial model
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