. psmatch2 t x1 x2, out(y) logit ate
Logistic regression Number of obs = 1000
LR chi2(2) = 222.78
Prob > chi2 = 0.0000
Log likelihood = -524.89072 Pseudo R2 = 0.1751
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t | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
x1 | .9068298 .0885341 10.24 0.000 .7333062 1.080353
x2 | .8100408 .0816962 9.92 0.000 .6499192 .9701624
_cons | -.8528442 .0788823 -10.81 0.000 -1.007451 -.6982378
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Variable Sample | Treated Controls Difference S.E. T-stat
----------------------------+-----------------------------------------------------------
y Unmatched | 1.8910736 -.423243358 2.31431696 .109094342 21.21
ATT | 1.8910736 .930722886 .960350715 .168252917 5.71
ATU |-.423243358 .625587554 1.04883091 . .
ATE | 1.01936701 . .
----------------------------+-----------------------------------------------------------
Note: S.E. does not take into account that the propensity score is estimated.
| psmatch2:
psmatch2: | Common
Treatment | support
assignment | On suppor | Total
-----------+-----------+----------
Untreated | 667 | 667
Treated | 333 | 333
-----------+-----------+----------
Total | 1,000 | 1,000
. pstest, both
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Unmatched | Mean %reduct | t-test | V(T)/
Variable Matched | Treated Control %bias |bias| | t p>|t| | V(C)
--------------------------+----------------------------------+---------------+----------
x1 U | .4327 -.23546 70.8 | 10.49 0.000 | 0.93
M | .4327 .45699 -2.6 96.4 | -0.34 0.737 | 0.98
| | |
x2 U | .40954 -.24135 66.3 | 9.81 0.000 | 0.92
M | .40954 .38004 3.0 95.5 | 0.39 0.699 | 0.92
| | |
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* if variance ratio outside [0.81; 1.24] for U and [0.81; 1.24] for M
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Sample | Ps R2 LR chi2 p>chi2 MeanBias MedBias B R %Var
-----------+-----------------------------------------------------------------------
Unmatched | 0.175 222.39 0.000 68.5 68.5 106.6* 0.92 0
Matched | 0.000 0.22 0.896 2.8 2.8 3.6 0.91 0
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* if B>25%, R outside [0.5; 2]
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