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st: Different critical values suggested by Stock and Watson


From   Duha Altindag <daltin2@tigers.lsu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Different critical values suggested by Stock and Watson
Date   Tue, 31 Mar 2009 17:43:02 -0500

1.	In their Econometrica note in 2008, Stock and Watson suggested
using clustered standard errors with critical value of
[sqrt(n/n-1)]*t_{n-1} instead of usual t distribution for tests on
beta in models that possibly have serially correlated errors (where n
is the number of groups).

Do the t-statistics in a regression output given by stata 10
incorporate this? That is, do the results of xtreg, fe cluster(c)
provide the p-values calculated by the method of Stock and Watson or
are they based on usual t critical values? If they are based on usual
t distribution, then I should compute the Stock-Watson critical values
by hand.

2.	In the same paper, S&W suggested a fix for Cov. Matrix in a FE
model. I think Stata incorporated this. Can anyone confirm?

Thank you.
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