On Aug 5, 2004, at 2:33 AM, Clive wrote:
You don't necessarily _have_ to use FGLS. You could, for instance, try
David Roodman's user-written -newey2-, downloadable from SSC. With this
routine, you can also fit a fixed-effects model _and_ obtain OLS
parameter
estimates corrected for both autocorrelation and heteroscedasticity.
For
instance:
. xi: newey2 y x1 x2 i.fe xk, lag(#) force
I was reminded about all this off-list by another Statalist member last
week. So long as you _don't_ have a lagged dependent variable, this
works
just as well as -areg- or -xtreg, fe-.
Not to disparage David's excellent work (from which we have liberally
'borrowed') but ivreg2 can do just about anything that newey2 can do,
and more (choice of different kernel estimators for the AC part; AC
without the H; etc.)
Kit
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