regress的帮助和manual里面有例子啊
Examples: regression with robust standard errors
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. sysuse auto, clear
. generate gpmw = ((1/mpg)/weight)*100*1000
. regress gpmw foreign
. regress gpmw foreign, vce(robust)
. regress gpmw foreign, vce(hc2)
. regress gpmw foreign, vce(hc3)
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. webuse regsmpl, clear
. regress ln_wage age c.age#c.age tenure, vce(cluster id)
最后这样就应该是的
. regress ln_wage age c.age#c.age tenure, vce(cluster id)
Linear regression Number of obs = 28101
F( 3, 4698) = 748.82
Prob > F = 0.0000
R-squared = 0.1644
Root MSE = .43679
(Std. Err. adjusted for 4699 clusters in idcode)
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| Robust
ln_wage | Coef. Std. Err. t P>|t| [95% Conf. Interval]
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age | .0752172 .0045711 16.45 0.000 .0662557 .0841788
|
c.age#c.age | -.0010851 .0000778 -13.94 0.000 -.0012377 -.0009325
|
tenure | .0390877 .0014425 27.10 0.000 .0362596 .0419157
_cons | .3339821 .0641918 5.20 0.000 .208136 .4598282
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