試試

感谢！

十分感谢！

黄老师好，请问如何用循环语句实现下面的过程呢？

  *2017
  gen crise2017 = 0
  gen year2017  = 0
  replace  year2017= 1 if year ==2017
  bysort code hs6 : replace crise2017 = down[2] if ((crise[2] == 1 & down[2] == 1) | (crise2018[1] == 1 & down[2] == 1))
  gen criseyear2017 = 0
  replace  criseyear2017 = 1 if year2017 + crise2017 == 2
  drop crise2017 year2017
  rename criseyear2017 crise2017
  
  *2016
  gen crise2016 = 0
  gen year2016  = 0
  replace  year2016= 1 if year ==2016
  bysort code hs6 : replace crise2016 = down[3] if ((crise[3] == 1 & down[3] == 1) | (crise2017[2] == 1 & down[3] == 1))
  gen criseyear2016 = 0
  replace  criseyear2016 = 1 if year2016 + crise2016 == 2
  drop crise2016 year2016
  rename criseyear2016 crise2016

  *2015
  gen crise2015 = 0
  gen year2015  = 0
  replace  year2015= 1 if year ==2015
  bysort code hs6 : replace crise2015 = down[4] if ((crise[4] == 1 & down[4] == 1) | (crise2016[3] == 1 & down[4] == 1))
  gen criseyear2015 = 0
  replace  criseyear2015 = 1 if year2015 + crise2015 == 2
  drop crise2015 year2015
  rename criseyear2015 crise2015