Hello, How can I solve this problem

[Yahya Ojagverdi]

use "data.dta", clear
qui: sum year
global y_max = r(max)
global y_min = r(min)
global y_count = ($y_max - $y_min)+1
g border = (dist >=-20 & dist <= 20)
g int_bfr = border * french
qui: include "sumstat.do"
variable expo not found
r(111); r(111);

[Nick Cox]

Some code you don't show us expects to be able to see a variable expo, but it can't. Perhaps the answer lies in the file data.dta; or perhaps it lies in the file sumstat.do. We can't see either.

[Yahya Ojagverdi]

Thank you for answering.
These are my files which you said Mr. Nick

[George Ford]

expo is not a variable in the dataset.