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Forward Orthogonal Deviations GMM and the Absence of Large Sample Bias

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  • Robert F. Phillips

Abstract

It is well-known that generalized method of moments (GMM) estimators of dynamic panel data models can have asymptotic bias if the number of time periods (T) and the number of cross-sectional units (n) are both large (Alvarez and Arellano, 2003). This conclusion, however, follows when all available instruments are used. This paper provides results supporting a more optimistic conclusion when less than all available instrumental variables are used. If the number of instruments used per period increases with T sufficiently slowly, the bias of GMM estimators based on the forward orthogonal deviations transformation (FOD-GMM) disappears as T and n increase, regardless of the relative rate of increase in T and n. Monte Carlo evidence is provided that corroborates this claim. Moreover, a large-n, large-T distribution result is provided for FOD-GMM.

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  • Robert F. Phillips, 2022. "Forward Orthogonal Deviations GMM and the Absence of Large Sample Bias," Papers 2212.14075, arXiv.org.
    • Handle: RePEc:arx:papers:2212.14075
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    References listed on IDEAS

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