The R language uses the matchit package for propensity matching analysis and match The data function constructs the matched sample set, and judges the balance of all covariates in the sample after the

R Language use MatchIt Package for propensity matching analysis 、 Use match.data Function to build the matched sample set 、 Through two samples t Test analysis （ Double independent samples t test ） To judge the balance of all covariates in the sample after propensity score matching

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