如何通过将其除以IQR来创建变量?我已经做了很多工作如下。
示例数据和代码如下:
use http://www.ats.ucla.edu/stat/stata/notes/hsb2, clear
foreach var of varlist read-socst {
egen `var'75 = pctile(`var'), p(75)
egen `var'25 = pctile(`var'), p(25)
gen `var'q =`var'75 - `var'25
drop `var'75 `var'25
}
gen readI = read/readq
gen sciI = science/scienceq
答案 0 :(得分:2)
最简单的方法就是直接使用summarize
结果:
sysuse auto, clear
quietly foreach v of var price-foreign {
su `v', detail
gen `v'q = `v' / (r(p75) - r(p25))
}
如果egen
路径意味着为每个原始变量创建新变量,只是为了将四分位数或IQR保持为重复常数,那么egen
路径就会过度。但是,如果您想通过群组执行此操作,bysort foreign: egen mpg_upq = pctile(mpg), p(75)
by foreign: egen mpg_loq = pctile(mpg), p(25)
gen mpg_Q = mpg / (mpg_upq - mpg_loq)
就会出现:
Echo '<img src="images/tick.png" id="tick' . $i .'" h1 class="hidden" style="position: absolute; top: 30px; left: 70px;"/>';
请注意,IQR可以为0,指示变量通常为0。