Dear Statalisters,
I am conducting an econometric research on energy economics. I am using xtivreg2 command for my regressions. I observed that using cluster(xyz) and i(xyz) where xyz is the unit of the panel data gives different results. Besides, there is a "robust" option for the xtivreg command. I searched to learn about their differences but could not find. Could you please help me about that? Thank you in advance.
Kind regards,