Thanks for the advice!
On 8/4/05, Richard Williams <[email protected]> wrote:
> At 03:05 PM 8/4/2005 -0400, Raymond wrote:
> >the command I'm using is:
> >xi:poisson death i.age i.cohort i.period, exposure(population) constraints (1)
>
> I believe the constraint is what is zapping you. You should notice that
> you are also getting a Wald chi-square instead of an LR
> chi-square. (Perhaps exposure zaps you too, but constraint definitely does.)
>
> You could probably calculate by hand. Alternatively, what is the
> constraint? You might be able to specify the constraint some other way,
> e.g. add 2 vars together so their estimated effects are equal.
>
>
> -------------------------------------------
> Richard Williams, Notre Dame Dept of Sociology
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