Rita:
because in your -regress- all the observations are considered as independent (please note that, under -regress-, -robust- takes only heteroskedastcity into account, but forget the panel-structure of your panel dataset).
Put differently, your estimates are unreliable.
because in your -regress- all the observations are considered as independent (please note that, under -regress-, -robust- takes only heteroskedastcity into account, but forget the panel-structure of your panel dataset).
Put differently, your estimates are unreliable.
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