如题,现已生成2010-2016年面板数据,包含各年份总支出的对数数据,但不知怎么生成Δlnexp?
- * Example generated by -dataex-. To install: ssc install dataex
- clear
- input long(pid fid10 fid12 fid14 fid16) double lnexp int year
- 370270101 370270 370270 . . 9.596648 2012
- 370270101 370270 370270 370270 . 9.713537 2014
- 370270101 370270 370270 370270 370270 9.968339 2016
- 370272101 370272 370272 . . 9.825093 2012
- 370272104 370272 370272 370272 . 9.995154 2014
- 370272101 370272 370272 370272 370272 9.94463 2016
- 370273101 370273 370273 . . 9.788638 2012
- 370273101 370273 370273 370273 . 9.561701 2014
- 370273101 370273 370273 370273 370273 10.47503 2016
- 370274101 370274 370274 . . 10.96606 2012
- end
- label var pid "pid"
- label var fid10 "fid10"
- label var fid12 "fid12"
- label var fid14 "fid14"
- label var fid16 "fid16"
- label var lnexp "lnexp"
- label var year "year"
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