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Subject: Re: glmfit binomial-probit with natural mortality
Date: Mon, 29 Sep 2008 23:26:02 +0000 (UTC)
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Hi Bego

So far I haven't found a suitable solution using glmfit. I even suspect that this function can't handle this type of fit (control mortality).

Regards
Joe

"Villamide Bego" <bvillamide@gmail.com> wrote in message <gbqs61$9ts$1@fred.mathworks.com>...
> Hi Joe, 
> 
> I have the same problem as you. Have you any solution to this question?
> 
> Thanks in advance.
> 
> Bego.
> 
> 
> 
> "Joe Ercolino" <joe_ercolino@hotmail.com> wrote in message <g6vilo$h12$1@fred.mathworks.com>...
> > Hi
> > 
> > I'm trying to fit a generalized linear model (GLM) with the
> > glmfit function. My problem deals with the
> > dose-response(Mortality)of a population of animals exposed
> > to a toxic agent. The most common models for this type of
> > regression use the binomial distribution and probit or logit
> > as link functions with the log(Dose) as predictors. The data
> > I'm working with shows a non zero response for the controls
> > (dose equal to zero). I think that the logit or probit
> > functions can not accommodate for this type type behavior
> > since they go from zero to one. Is there a way to make
> > glmfit to take into account the controls correction (natural
> > mortality) or there is any other feasible way to do it in
> > MATLAB?
> > 
> > Thanks in advance.