Thank you very much Joseph. Just what I needed.
Regards,
Ricardo.
--- Joseph Coveney <[email protected]> wrote:
> Ricardo Ovaldia wrote:
>
> I have data from an experiment where 50 pregnant
> rats
> were scarified and their embryos randomly assigned
> to
> two culture mediums. However, since the number of
> embryos from each rat varies, the number of embryos
> allocated to each media from each rat also varies.
> Thus I have a M-N match within rat. (All rats have 2
> or more embryos)
>
> If the outcome was dichotomous, I could use -clogit-
> to analyze these data. However, the outcome, "embryo
> grade", is an ordered variable ranging from 1 to 5.
> What I would need is then a conditional ologit, but
> that does not seem to exist. Any suggestions would
> be
> appreciated.
>
>
--------------------------------------------------------------------------------
>
> A couple of possibilities come to mind. One would
> be -gllamm- or -reoprob-,
> e.g.,
> -xi: gllamm embryo_grade i.culture_medium, i(dam)
> family(binomial) ///
> link(oprobit) adapt . . .-
>
> Another, if you're interested only in
> hypothesis-testing, would be -npt_s-,
> another user-written command, e.g.,
> -npt_s embryo_grade, by(culture_medium)
> strata(dam)-.
>
> Joseph Coveney
>
> *
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> *
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>
Ricardo Ovaldia, MS
Statistician
Oklahoma City, OK
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