- use "省级数据2019年7月22日.dta", clear
- by id, sort:egen yrmax = max(wk_e)
- by id, sort:egen yrmin = min(wk_s)
- keep id yrmax yrmin prvn
- duplicates drop
- rename id id1
- save province.dta, replace
- use "市级数据2019年7月22日.dta", clear
- by id, sort:egen yrmax2 = max(wk_e)
- by id, sort:egen yrmin2 = min(wk_s)
- keep id yrmax yrmin prvn
- duplicates drop
- joinby prvn using province.dta
- sort prvn
- drop if yrmin > yrmax2
- drop if yrmax < yrmin2
- gen min = yrmin if yrmin >= yrmin2
- replace min = yrmin2 if min == .
- gen max = yrmax if yrmax <= yrmax2
- replace max = yrmax2 if max == .
- keep id id1 max min prvn


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