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# re: Antwort: re: st: xtreg xtregar

 From Christopher Baum To Subject re: Antwort: re: st: xtreg xtregar Date Tue, 4 Jan 2011 15:29:06 -0500

<>
"the size of the Nickell-bias depends on both T and N. There are cases where
the bias is negligeably small."

There may be such cases, but a panel with 3-5 years of data per unit is about the worst case imaginable. My class notes include

"Nickell demonstrates that the inconsistency of \hat{\rho} as n → ∞ is of order 1/T,
which may be quite sizable in a “small T” context. "

If I received a paper to review in which the author ignored Nickell bias without a convincing argument that it was indeed negligible in his/her context, I would be inclined to reject the paper.

Kit

Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming  |   http://www.stata-press.com/books/isp.html
An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html

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