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st: how to do balancing test in diff command


From   Sungwook Kim <woogidc@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: how to do balancing test in diff command
Date   Fri, 4 Jan 2013 15:18:10 +0000

Hi,

I'm stuck with how to perform balancing test in diff command.


I performed DID analysis , and this is the result of balancing test
with  1 covariate(health_expen).

Number of observations (baseline): 38
            Baseline       Follow-up
   Control: 37             -           37
   Treated: 1              -           1
            38             -

t-test at period = 0:
----------------------------------------------------------------------------------------------
 Variable(s)         |   Mean Control   | Mean Treated |    Diff.   |
 |t|   |  Pr(|T|>|t|)
---------------------+------------------+--------------+------------+---------+---------------
gencost_yr           | 1309.432         | 1800.000     | 490.568    |
   .   |     .
health_expen         | 48.378           | 63.673       | 15.295     |
2.20   | 0.0277**
----------------------------------------------------------------------------------------------
*** p<0.01; ** p<0.05; * p<0.1

.
Is this mean that I have to perform DID with 'health_expen' variable?
Why gencost_yr is showed with dot?

When I perform with other variables , they are not significant. Is
this mean that I can't perform DID with the variables?

Thanks in advance.
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