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]

From |
Sophie Jensen <thorns.n.roses@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Matching |

Date |
Mon, 4 Oct 2010 23:50:26 +0100 |

Here's what I've done... how would you interpret that: . psmatch2 treatment white fsm male if year>2006, n(1) Probit regression Number of obs = 15471 LR chi2(4) = 322.40 Prob > chi2 = 0.0000 Log likelihood = -678.85535 Pseudo R2 = 0.1919 ------------------------------------------------------------------------------ treatment | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- ewhite | .172414 .1514341 1.14 0.255 -.1243915 .4692194 fsm | 1.650061 .2705032 6.10 0.000 1.119885 2.180238 male | .0000787 .0000105 7.50 0.000 .0000581 .0000992 _cons | .4350676 .8062152 0.54 0.589 -1.145085 2.01522 ------------------------------------------------------------------------------ pstest fsm eth_white ks2mn outwage_male ---------------------------------------------------------------------------- | Mean %reduct | t-test Variable Sample | Treated Control %bias |bias| | t p>|t| ------------------------+----------------------------------+---------------- fsm Unmatched | .32883 .13543 136.0 | 18.34 0.000 Matched | .32883 .328 0.6 99.6 | 0.04 0.968 | | white Unmatched | .58394 .829 -89.1 | -12.70 0.000 Matched | .58394 .54751 13.2 85.1 | 1.00 0.318 | | male Unmatched | 28221 24729 92.7 | 11.82 0.000 Matched | 28221 28606 -10.2 89.0 | -0.87 0.387 | | On Mon, Oct 4, 2010 at 11:35 PM, Santosh Kumar <santosh.uh@gmail.com> wrote: > 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/ > * * 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/

**Follow-Ups**:**Re: st: Matching***From:*Sophie Jensen <thorns.n.roses@gmail.com>

**References**:**st: Matching***From:*Sophie Jensen <thorns.n.roses@gmail.com>

**Re: st: Matching***From:*Sophie Jensen <thorns.n.roses@gmail.com>

**Re: st: Matching***From:*Santosh Kumar <santosh.uh@gmail.com>

- Prev by Date:
**Re: st: Matching** - Next by Date:
**Re: st: Matching** - Previous by thread:
**Re: st: Matching** - Next by thread:
**Re: st: Matching** - Index(es):