On estimating firm-level production functions using proxy variables to control for unobservables
In the common case where polynomial approximations are used for unknown functions, I show how proxy variable approaches to controlling for unobserved productivity, proposed by Olley and Pakes [Olley, S. and Pakes, A., 1996. The dynamics of productivity in the telecommunications equipment industry. Econometrica 64, 1263-1298.] and Levinsohn and Petrin (Levinsohn, J. and Petrin, A., 2003. Estimating production functions using inputs to control for unobservables. Review of Economic Studies 70, 317-341.], can be implemented by specifying different instruments for different equations and applying generalized method of moments. Studying the parameters within a two-equation system clarifies some key identification issues, and joint estimation of the parameters leads to simple inference and more efficient estimators.
Year of publication: |
2009
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Authors: | Wooldridge, Jeffrey M. |
Published in: |
Economics Letters. - Elsevier, ISSN 0165-1765. - Vol. 104.2009, 3, p. 112-114
|
Publisher: |
Elsevier |
Keywords: | Production function Panel data Proxy variables Generalized method of moments |
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