- forvalue i = 2004/2018{
- preserve
- capture {
- keep if year == `i'
- set seed 0000
- gen norvar_2 = rnormal()
- sort norvar_2
- psmatch2 group $xlist , outcome(entre_activation) logit neighbor(2) ///
- ties common ate caliper(0.05)
- save `i'.dta, replace
- }
- restore
- }
做法参考白俊红教授的《创新驱动政策是否提升城市创业活跃度》一文


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