Add a pooling in my loop

[Liyaa CC]

Hello

I am creating a simulation for comparing different methods.
I want to add a fixed pooling in my loop but I always got error.
May I ask how can I fixed it?

Thank you!


Here's my code for the loop:

foreach u0 of local u0list{
foreach cluster of local clusterlist{
forvalues i = 1/`nSims'{

set obs `n'
gen index = _n
gen trt = mod(_n,2)
gen site = mod(_n -1, `cluster') + 1
gen u0 = rnormal(0,`u0')
gen y = u0 + 0.4 * trt + rnormal()

* set baseline

fvset base 1 site


* t test
ttest y, by(trt)
local tp = `r(p)'
local tEST = r(mu_2) - r(mu_1)

* pooling

frame create results2 site trt se y
forvalues s = 1/`centre' {
regress y trt if site == `s'
local pop = `r(p)'
local poEST = _b[trt]
local poSE = _se[trt]
frame post results2 (`s') (`poEST') (`pop') (y)
}

cwf results2
meta set trt se, random
meta summarize

frame post results (`n') (`u0') (`cluster') (`tp') (`tEST') (`poEST') (`pop')
}

}
}

cwf results