Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: Matching
From
Sophie Jensen <[email protected]>
To
[email protected]
Subject
Re: st: Matching
Date
Mon, 4 Oct 2010 23:51:17 +0100
how do you ensure random sorting... just sort on some varibale?
How do you do area matching... radius matching... do you know
Thanks
S
On Mon, Oct 4, 2010 at 11:50 PM, Sophie Jensen <[email protected]> wrote:
> 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/
>>
>
*
* 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/