Message-ID: <6EF548A4-BE20-473A-9FC5-8BCA56172BB5@comcast.net>
Date: 2009-11-24T22:36:11Z
From: David Winsemius
Subject: overdispersion and quasibinomial model
In-Reply-To: <26502728.post@talk.nabble.com>
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