命令是这样的，psmatch2 medin gender age marriage1 city2 education1 healthcondition1 dabing sumshouru msyreconomic tongzhu1, outcome(beifangmedical) n(4) ate ties logit common，本来PSM前还是treated结果大于control, 为什么匹配后，结果变成treated结果小雨control效应呢？


求各位高手指导