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st: event history and research design question

From   "andrew enterline" <>
Subject   st: event history and research design question
Date   Fri, 22 Nov 2002 10:35:49 -0600


I have a sample of 213 civil wars. My dependent variable of interest is civil war duration. A subset of this sample 213 civil wars--18 civil wars--experience a third party intervention. I measure several independent variables pertaining to these 18 cases with intervention. Unfortunately, these independent variables are not measured for the 195 cases in which intervention did not occur. However, I'd prefer to include the information for the dependent variable (i.e., the duration) for these 195 cases in order to serve as a benchmark against which to assess the intervention subset. One of my colleagues suggested using the -stset- command for "late entry" to retain this information on the dependent variable for these cases, but avoid including zeros for observations where the intervention variables are unmeasured. Another suggestion was to drop an event history approach altogether in favor of testing differences of means for different subsamples in the data, but this approach has limitations as well.

Would anyone have any suggestions about how I might address this problem, or citations to similar designs in the literature? I am open to any recommendations whatsoever.

thank you ahead of time,
Andrew Enterline

University of North Texas
Dept. of Political Science
Box 305340
Denton, TX 76203
(v) 940.565.2313
(f) 940.565.4818

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