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st: No R-Squared Output

From   Meissner Chris <>
Subject   st: No R-Squared Output
Date   Sun, 7 Mar 2004 02:31:43 -0800 (PST)

Sometimes when I run instrumental variables
regressions of the form

ivreg y (x = z), robust

stata does not produce an R-squared value. Does any
one know why this might be?

Thanks in advance.

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