Stata增长率的求法

/*investg为年增长率*/
webuse grunfeld, clear
xtset company year
gen linvest = log(invest)
gen investg = D.linvest



/*求同固定基年的增长率*/
webuse grunfeld, clear
xtset company year
bys company (year): gen invest1935 = invest[1]
gen investg = log(invest/invest1935)

/*年均增长率：年增长率求均值*/
webuse grunfeld, clear
xtset company year
gen linvest = log(invest)
gen investg = D.linvest
bys company (year): gen mean_investg = mean(investg)

/*年均增长率：复式计算法*/
webuse grunfeld, clear
xtset company year
    bys company year: gen linvest2010 = linvest[14]
    bys company year: gen linvest2016 = linvest[20]
    gen mean_investg=  ((linvest2016/linvest2010)^(1/6)-1)*100