Sorry, I forgot...
could it be the problem of centered R^2, that is different from a normal R^2??
Anyway, knowing how xtivreg2 do the first stage is already enough.
Thank you
2007/6/2, alessia matano <[email protected]>:
Dear all
I would like ti ask you a question: does anyone of you knows what
kind of estimation is the first stage in xtivreg2, fe??
Is that a simple OLS estimation, or a xtreg, fe one??
Because I am trying to replicate the first stage myself, and i am not
able. The reason is that when I apply my estimation with only my
instrument the R^2 get high, and when I do the first stage with the
other instruments (the ones supposed for the other variables and the
exogeneous variables), the R^2 is not so good anymore?
Can anyone help me to understand??
Thank you
alessia
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