Hi,

I have an unbalanced panel dataset for 2000+ companies from 1992-2018. Following was the xtset output:

xtset
panel variable: company_id (unbalanced)
time variable: fiscalyear, 1992 to 2018, but with gaps
delta: 1 unit

xtreg command is giving results that are very much different from reg command. If the dataset is very unbalanced, should I proceed with reg or xtreg?

Thanks!