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p2sq
2009 Jul 08
1
clogit comparison between Stata and R
...ct + I(timesince.dict^2) +
p_polity2 + I(p_polity2^2) + strata(ccodecow) + cluster(ccodecow),
method="approximate", data=univ)
and I get an n of 3747.
In Stata, I run
clogit trans_dem avg_gle_rgdp_ratio loggle_rgdp timesince_dem
timesince_demsq timesince_dict timesince_dictsq p_polity2 pol2sq,
group(ccodecow) vce(cluster ccodecow)
which I hope is the same model. I get a message "29 groups (935 obs) dropped
because of all positive or all negative outcomes", and an n of 2812. Also,
the coefficients are slightly different.
I understand why Stata is dropping the groups with all...