Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
| From | Santosh Kumar <santosh.uh@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: Matching |
| Date | 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) neighbor(3) 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 Treatment support 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 <thorns.n.roses@gmail.com> wrote: > Could someone perhaps explain the process of this kind of matching please. > > Thanks > > S > > On Mon, Oct 4, 2010 at 11:26 PM, Sophie Jensen <thorns.n.roses@gmail.com> 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. >> >> Thanks >> >> S >> * >> * 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/ > -- Santosh * * 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/