Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: Matching
Santosh Kumar <firstname.lastname@example.org>
Re: st: Matching
Mon, 4 Oct 2010 18:35:45 -0400
This is an example of matching with 3 neighbors.
psmatch2 improved, pscore(pscore) outcome(diarr) common caliper(.001)
There are observations with identical propensity score values.
The sort order of the data could affect your results.
Make sure that the sort order is random before calling psmatch2.
(4005 missing values generated)
Variable Sample Treated Controls Difference S.E. T-stat
diarr Unmatched .104890901 .125810627 -.020919727 .001373497 -15.23
ATT .104893374 .110885821 -.005992448 .007151216 -0.84
Note: S.E. for ATT does not take into account that the propensity
score is estimated.
psmatch2: psmatch2: Common
assignment Off suppo On suppor Total
Untreated 0 159,136 159,136
Treated 2 84,829 84,831
Total 2 243,965 243,967
On Mon, Oct 4, 2010 at 6:28 PM, Sophie Jensen <email@example.com> wrote:
> Could someone perhaps explain the process of this kind of matching please.
> On Mon, Oct 4, 2010 at 11:26 PM, Sophie Jensen <firstname.lastname@example.org> wrote:
>> Dear statlisters,
>> What is the difference between a 1-1 to match and the nearest
>> neighbour match in stata. I would like to do a nearest neighbour
>> match, a 1-1 and then specifiy a distance to match on.
>> * For searches and help try:
>> * http://www.stata.com/help.cgi?search
>> * http://www.stata.com/support/statalist/faq
>> * http://www.ats.ucla.edu/stat/stata/
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
* For searches and help try: