TY  - JOUR
AU  - Hoxby,Caroline
AU  - Paserman,M. Daniele
TI  - Overidentification Tests with Grouped Data
JF  - National Bureau of Economic Research Technical Working Paper Series
VL  - No. 223
PY  - 1998
Y2  - February 1998
UR  - http://www.nber.org/papers/t0223
L1  - http://www.nber.org/papers/t0223.pdf
N1  - Author contact info:
Caroline Minter Hoxby
Department of Economics
Stanford University
Landau Building, 579 Serra Mall
Stanford, CA 94305
Tel: 650-725-8719
Fax: 650-725-5702
E-Mail: choxby@stanford.edu

Daniele Paserman
Department of Economics
Boston University
270 Bay State Road
Boston, MA 02215
Tel: 1-617-3535695
Fax: 1-617-3534449
E-Mail: paserman@bu.edu
AB  - This paper examines the validity of overidentification tests and exogeneity tests in the presence of grouped data.  We find that even a small intra-group correlation, when instruments do not vary within groups, may generate a substantial bias in the standard overidentification tests described in textbooks.
ER  -