I am running a panel regression with year and region fixed effects.
I am getting different coefficient values for
(1) reghdfe y x i.year, absorb(region)
(2) reghdfe y x, absorb(year region)
where x consists of indicator variables that pertain to treatment periods (periods before and after treatment)
For (1) I have one year dummy omitted due to colinearity wheres for (2) I have one of the x's being omitted due to colinearity. So the coefficient values for x in (1) and (2) are quite different.
Does anyone have any idea why this would be the case?
I am running a panel regression with year and region fixed effects. I am getting different coefficient values for
(1) reghdfe y x i.year, absorb(region) (2) reghdfe y x, absorb(year region)
where x consists of indicator variables that pertain to treatment periods (periods before and after treatment)
For (1) I have one year dummy omitted due to colinearity wheres for (2) I have one of the x's being omitted due to colinearity. So the coefficient values for x in (1) and (2) are quite different. Does anyone have any idea why this would be the case?