求助：在fortran中很容易实现的求累积和，怎样在stata中实现？

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在fortran中很容易实现的求累积和，怎样在stata中实现？

即，本期累加教育年限 = 前期教育累加年限＋本期参加教育与否



fortran code example （仅仅表达上述问题意思，code本身极有可能是错误的）

do 1 t=1/10
   acedu_t=acedu_t-1 + edu_t
1 continue


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关键词：Fortran Stata tata Fort RAN 求助 Stata Fortran

*对x求累积和
g s=sum(x)

thanks. the sum() gives the total but not accumulative sum for each period.

here is the right code

gen byte acedu1=edu1
forvalue i=2/17 {
  local j=`i'-1
  gen byte acedu`i'=edu`i'+acedu`j'
}

feelinginwind 发表于 2010-4-6 05:58 thanks. the sum() gives the total but not accumulative sum for each period.

really?

(g x=sum(y))

for a long data, use sum() has to control the id for longitudinal data. how to control the id here?

feelinginwind 发表于 2010-4-8 22:51 for a long data, use sum() has to control the id for longitudinal data. how to control the id here?

*Do you want

bys id: g s=sum(x)

egen s=sum(x) 即可

htslchy 发表于 2010-4-24 18:28 egen s=sum(x) 即可

这个不是累积求和，是一并求和

6th floor is what I wantted (for long data). thanks