Hi everyone,

I am trying to replicate a paper to get my self familiar with STATA. I the paper comes with a replication dataset and the necessary code. In all the regression commands in the replication code I see the keyword " 'control' ". My question is what does " 'control' " do? I run a few regressions with and without it, and the output seemed to be the same. Bellow you can see where the authors place the keyword in their code:

xi:xtreg depvar indepvars `control' ,fe cluster(country)

xi:oprobit depvar indepvars i.country `control', cluster(country)

xi:xtabond depvar indepvars endogenousvar `control' , robust lags(1) endogenous(endogenousvar)

Thanks.