Tuesday, March 07, 2006

Re: st: helped with fixed effects logit

Not my field, but I think you should have two observations on each crisis, one for each country--otherwise you are constraining the effect of democstateA and democstateB to be the same when they represent different countries, right? I mean, if Sudan is country A one time and country B another time, then Sudan is making a contribution to both coefficients, and which one they contribute to in which year is arbitrary, right? Once you -reshape democstate, i(crisis_id) j(state) str- you can

clogit DV democ controls, group(country_id)

I guess--but have you considered whether democstate is exogenous to crisis behavior? Especially in the fixed-effects formulation, where you are identifying the effect off changes in status, from democracy to not, or from not democ to democ, I would guess that crises can cause democ status at least as much as vice versa. Not to name any names or dates.

On 3/7/06, Michael Horowitz <horowitz@fas.harvard.edu> wrote: > To whom it may concern: > > I have a paper where I am examining the impact of democracy on crisis > behavior. I need to estimate a fixed effects or conditional logit model > but I am not sure how. > > The data is set up dyadically, meaning each observation has data on the > crisis and data for state A in the crisis and state B in the crisis > > Here is the functional form of the logistic regression I have run > > logit DV democstateA democstateB control1 control2 control3 control4 > > I need to estimate a fixed effects model to control for the impact of > specific countries. I know that I need to use conditional logit to > control for unmeasured heterogeneity. > > But I am not sure how to do it. Specifically, in the clogit setup, it > should look like: > > clogit DV democstateA democstateB control1 control2 control3 control4, > group(????). > > What I am unclear about is what goes in the parentheses. If anyone could > assist, I would very much appreciate it. I apologize for asking such a > basic question. > > Regards, > Michael Horowitz > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ >

* * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/


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