如果你是分析treatment group 和control group 两组 一年前后的不同, 这里我提点建议:
如果用参数分析: 1. gen difference=var-l.var
2. gen Dummy=1 if 是treatment group
replace Dummy=0 if 是control group
3. reg difference Dummy `varlist'
用半参数分析 用DDM difference in Difference Matching
stata command: psmatch2