How can I see the specific version of code ran in each iteration of a foreach loop?

[Steven Hankey]

I ran the code below. It is a foreach loop where it runs a regression on a different subset of the data for each iteration. Each subset corresponds to the rows that have a unique value for the variable project_id. When the code runs it displays the results from each of the regressions it runs. I would like to know which regression result corresponds to which values of each proejct_id. Put differently, I would like to be able to see the specific code that is run for each iteration of the loop. How can I do this?

levelsof id, local(project_id)
foreach i in `project_id' {
reg vote_share treatment if id == `i' | treatment == 0
}

[Hemanshu Kumar]

The easiest might be to include a line inside the loop to display the id, something like this:

levelsof id, local(project_id)
foreach i in `project_id' {
    dis "Regression for `i':"
    reg vote_share treatment if id == `i' | treatment == 0
}

[Nick Cox]

Hemanshu Kumar was spot on in terms of general advice. If I follow what is being done correctly, you would benefit from much more reporting, including two counts

count if id == `i' & treatment < . 

count if treatment == 0 & id != `i'

as these are the disjoint subsets being pooled in each regression.

I am ruling out | (or) being a typo for & (and) as insisting on treatment == 0 would give you no regression.