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st: Nonlinear Panel Data


From   sazas <s_azagba@live.concordia.ca>
To   statalist@hsphsun2.harvard.edu
Subject   st: Nonlinear Panel Data
Date   Thu, 28 Oct 2010 13:38:58 -0700 (PDT)

I am studying the the effectiveness of a policy (policy effect) using panel
data (T=5). The dependent outcome is dichotomous (binary). The panel data am
using have two waves before the policy was implemented and three waves post
policy implementation. My policy dummy takes the value of 0 pre policy
implementation and 1 otherwise.

I have estimated my model using random effect probit/logit model and
conditional fixed model. 
The policy effect variable which is of interest to me is quite different
between the random and fixed effect model. In the fixed effect model, more
than 70% of the observations are lost due to lack of within variation in the
data. I am not comfortable reporting just the random effect model due to the
unpalatable assumptions.

Please any advice?


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