Stata跑GPSM的时候，一直显示报错

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求教 为什么倾向得分计算完之后区分不出两组值啊，我看也有人发帖了 但是没人回复具体原因
******************************************************************************
The set of the potential treatment values is divided into 1 intervals

The values of the gpscore evaluated at the representative point of each
treatment interval are divided into 10 intervals
******************************************************************************

***********************************************************
Summary statistics of the distribution of the GPS evaluated
at the representative point of each treatment interval
***********************************************************


************************************************************************************
Test that the conditional mean of the pre-treatment variables given the generalized
propensity score is not different between units who belong to a particular treatment
interval and units who belong to all other treatment intervals
************************************************************************************
1 group found, 2 required

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关键词：Stata tata GPS PSM distribution

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