Creating a new variable using percentage in a stratified randomisation

[Anika Zaman]

Hi all,

I am trying to create a new variable while doing a stratified randomisation. Please help.

I want a new variable 'selected' which will take the first 60% of the rank as selected=1. I basically need 60% student of each class to be selected for the treatment (50% male and 50% female).The code I was using previously created rank for each school and I was taking 15 students regardless of class size.Gen_stu is the variable for gender and Types_Student=3 means co-education school where we have both male and female students.

Please note each school has student of only one grade so when I created rank by School_ID I am giving a rank to each student in the class.

My codes are:
clear

local seeds "482321 128828"


foreach X of local seeds{
set seed `X'
use "C:\Users\Anika Zaman\Dropbox\IVR SSC\Stata\Upadated_dataset_IVR.dta" , replace
joinby Record_ID using "C:\Users\Anika Zaman\Dropbox\IVR SSC\Stata\Student_Assessment_IVR.dta"
merge m:1 School_ID using "C:\Users\Anika Zaman\Dropbox\IVR SSC\Stata\Final School listing survey(Version 3).dta"
gen random=uniform()
sort School_ID random
bysort School_ID: gen rank=_n
generate treated_student=1 if rank<=15
replace treated_student=0 if rank>15
bysort School_ID Gen_stu: gen rankbg=_n
generate treated_student_b=1 if rankbg<=7 & Gen_stu==1 & Types_Student==3
replace treated_student_b=0 if rankbg>7 & Gen_stu==1 & Types_Student==3
generate treated_student_g=1 if rankbg<=7 & Gen_stu==2 & Types_Student==3
replace treated_student_g=0 if rankbg>7 & Gen_stu==2 & Types_Student==3
}

Thank you.