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Re: st: Matching
From
Sophie Jensen <[email protected]>
To
[email protected]
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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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/
>
*
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