在使用一对一配对时,出现
There are observations with identical propensity score values.
The sort order of the data could affect your results.
Make sure that the sort order is random before calling psmatch2.
然后作者建议在使用PSMATCH2之前要使用
gen u = uniform()
sort u
请问这个要怎么理解,能不能举个例子?谢谢


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