Can the "pstest" command be used following a
"psmatch2" command that includes the "ate" option?
Specifically, I am using the following:
/**Begin Code**/
psmatch2 itg, out(empl2_4 empl2_8 empl2_12)
pscore(phat)
noreplacement common ate;
pstest indy_g1 indy_g2 indy_g3 indy_g4 indy_g5 indy_g6
indy_g7 indy_g8
indy_g9 educ_g1 educ_g2 educ_g3 educ_g4
pre_g1 pre_g2 pre_g3 pre_g4 pre_g5 ten_g1 ten_g2
ten_g3 ten_g4
atl_reg so_reg no_reg qtr1 qtr2 qtr3 qtr4, sum t(itg)
support(_support);
/**END code**/
I gather the answer is likely no since the
documentation notes "pstest only considered balancing
for the treated" (att). However,if "pstest" can be
used
following a "psmatch2" with the option "ate", please
read on.
When I run the above code with the ATE I get very odd
results, and the results are much more reasonable
when I run the same code without the ATE. When
invoking the ATE option, I find Pstest yields control
distributions
that are very different than the treatment
distribution. Moreover only 3 of 219 control
individuals (i.e. _treatment=0 & support=1) have
weight=1 and the remaining 216 folks have no value
for the weight variable. All of the 219 treatment
individuals have a weight value=1.
In contrast, when I re-run the psmatch & pstest
command without the ATE option, the pstest results
make much more sense and all of the 219 control
individuals
have a weight value=1. Also all the 219 treatment
individuals have weight=1. Is there some option I am
missing when running the routine with ATE?
Thanks,
-Leela Hebbar
*******
Rutgers University
Bloustein School of Planning & Public Policy
__________________________________
Yahoo! FareChase: Search multiple travel sites in one click.
http://farechase.yahoo.com
*
* 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/
