Hi Lincoln,
Some thoughts:
1) Did you intend to use  "cohort" as a factor and not as a numeric? (at
least that is what it looks like in your output)
2) Is there a strong correlation between "cohort" and the
other explanatory variables you are trying in your model?




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On Mon, May 7, 2012 at 10:28 AM, lincoln <miseno77@hotmail.com> wrote:

> Thanks Tal for answering,
>
> Anyway I still have no idea on why the binomial GLM is missing the
> relationship between the response variable and the explanatory variable
> "cohort".
>
> Is there anyone who might help me to understand this?
>
>
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