Stata 如何对CEM匹配的数据运行ttest？

我已经使用Stata对我的数据运行了CEM匹配过程，现在我想知道如何对匹配数据的变量运行t检验

/* Simple example of my code; first I run the CEM */
cem age gender education, treatment(treat)

/* Then I want to have a look at the summary statistics of the entire population and the matched data (this code works fine) */
summarize age gender education
summarize age gender education [iweight=cem_weights]

/* But if I want to do a t test only on the matched data, I get an error with the weights */
ttest age, by(treat) /* works fine */
ttest age [iweight=cem_weights], by(treat) /* error saying that weights are not allowed */

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如何仅对匹配的数据运行t测试？还可以选择导出匹配的数据，那么我如何才能做到这一点呢？

类似这样的操作应该可以做到：

sysuse auto, clear
cem mpg weight rep78, treatment(foreign)
mean price [iweight = cem_weight], over(foreign)  //coeflegend
lincom _b[c.price@1.foreign] - _b[c.price@0.foreign]

就个人而言，我只会使用回归和het稳健标准误差（在这里得到类似的结果，并且在更大的样本中会更接近）：

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像这样的东西应该可以做到：

sysuse auto, clear
cem mpg weight rep78, treatment(foreign)
mean price [iweight = cem_weight], over(foreign)  //coeflegend
lincom _b[c.price@1.foreign] - _b[c.price@0.foreign]

就个人而言，我只会使用回归和het稳健标准误差（在这里得到类似的结果，并且在更大的样本中会更接近）：