bootstrapping with inequal7

[Arun Chaudhary]

Hello all,
I have a long dataset and am trying to bootstrap differences between coefficient of variation (COV) in two years. I am using the command below and have tried several variations. Any help would be very much appreciated.

bootstrap diff = (r(cov1) - r(cov2)), reps(50) seed(51617) strata(year): inequal7 adaF_, by(year) if year == 1994 | year == 2022

Thanks,
Arun

[Felix Bittmann]

Inequal7 does not accept by, you need to write a program for this goal:

clear all
version 16.1
webuse nlswork
keep if inlist(year, 68, 80)


cap program drop inequaldiff
program define inequaldiff, rclass
   inequal7 ln_wage if year == 68
   local res1 = r(cov)
   inequal7 ln_wage if year == 80
   local res2 = r(cov)
   return scalar diff = `res1' - `res2'
end


inequaldiff        //Test
return list


bootstrap result = r(diff), reps(50) seed(123) strata(year): inequaldiff
estat bootstrap

[Arun Chaudhary]

Felix Bittmann: I was able to run the test—many thanks for your help.