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st: Adjusted standard errors

From   "Kaganova, Yevgeniya" <>
To   <>
Subject   st: Adjusted standard errors
Date   Tue, 28 Apr 2009 16:29:21 -0400

Dear list,

I have a question regarding the study that was done annually. Each year
a comparison group was selected by matching the treatment group. This
was done  without replacement, so the comparison group records in each
year are unique. When several years were combined together it appeared
that the total comparison group  has  duplicates - out of 105,000
records only 65,000 have unique IDs.  The question is what would be the
best way to adjust standard errors in the descriptive tables  for the
duplicates in the combined comparison group? 

Thank you in advance, Eugenia

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