diff lnedv_defla,period(per) treated(tre) robust cov( subrev typeofbus last scaleofbus nldz pldz fdi_gdp gdppc pu
> bf_gdp) kernel id ( umi ) report
KERNEL PROPENSITY SCORE MATCHING DIFFERENCE-IN-DIFFERENCES
    Report - Propensity score estimation with probit command
    Atention: _pscore is estimated at baseline

note: outcome = nldz > 1 predicts data perfectly except for
      nldz == 1 subsample:
      nldz dropped and 363 obs not used

outcome = pldz > 1 predicts data perfectly
r(2000);

求助大神如何解决？