在做stata的psm时出现r(2000) psmatch2 baohuqu jumindis heliudis jingliulia xiegao,out(mianji) logit neighbor(1)
> common caliper(.05) ties
outcome = heliudis <= 14027.61 predicts data perfectly
r(2000);
end of do-file
r(2000);
error . . . . . . . . . . . . . . . . . . . . . . . . Return code 2000
no observations;
You have requested some statistical calculation and there are
no observations on which to perform it. Perhaps you specified
if or in and inadvertently filtered all the data.
这怎么解决啊,字符类型是对的啊


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