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An Expository Note on the Existence of Moments of Fuller and HFUL Estimators

Author(s)
Chao, John C.; Hausman, Jerry A.; Newey, Whitney K.; Swanson, Norman R.; Woutersen, Tiemen
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Abstract
In a recent paper, Hausman, Newey, Woutersen, Chao, and Swanson (2012) propose a new estimator, HFUL (Heteroscedasticity robust Fuller), for the linear model with endogeneity. This estimator is consistent and asymptotically normally distributed in the many instruments and many weak instruments asymptotics. Moreover, this estimator has moments, just like the estimator by Fuller (1977). The purpose of this note is to discuss at greater length the existence of moments result given in Hausman et al. (2012). In particular, we intend to answer the following questions: Why does LIML not have moments? Why does the Fuller modification lead to estimators with moments? Is normality required for the Fuller estimator to have moments? Why do we need a condition such as Hausman et al. (2012), Assumption 9? Why do we have the adjustment formula?
Date issued
2012
URI
http://hdl.handle.net/1721.1/82654
Department
Massachusetts Institute of Technology. Department of Economics
Journal
Essays in Honor of Jerry Hausman (Advances in Econometrics)
Publisher
Emerald (MCB UP)
Citation
Chao, John C., Jerry A. Hausman, Whitney K. Newey, Norman R. Swanson, and Tiemen Woutersen. An Expository Note on the Existence of Moments of Fuller and HFUL Estimators. Emerald (MCB UP ), 2012.
Version: Author's final manuscript
ISBN
978-1-78190-307-0
ISSN
0731-9053

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