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Discussion Paper Details

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Title: Factor based identification-robust inference in IV regressions

Author(s): George Kapetanios, Lynda Khalaf and Massimiliano Marcellino

Publication Date: February 2015

Keyword(s): factor model, identification-robust inference, IV regression, new Keynesian model, principle components and weak instruments

Programme Area(s): International Macroeconomics

Abstract: Robust methods for IV inference have received considerable attention recently. Their analysis has raised a variety of problematic issues such as size/power trade-offs resulting from weak or many instruments. We show that information-reduction methods provide a useful and practical solution to this and related problems. Formally, we propose factor-based modifications to three popular weak-instrument-robust statistics, and illustrate their validity asymptotically and in finite samples. Results are derived using asymptotic settings that are commonly used in both the factor and weak instrument literatures. For the Anderson-Rubin statistic, we also provide analytical finite sample results that do not require any underlying factor structure. An illustrative Monte Carlo study reveals the following. Factor based tests control size regardless of instruments and factor quality. All factor based tests are systematically more powerful than standard counterparts. With informative instruments and in contrast with standard tests: (i) power of factor-based tests is not affected by k even when large, and (ii) weak factor structure does not cost power. An empirical study on a New Keynesian macroeconomic model suggests that our factor-based methods can bridge a number of gaps between structural and statistical modeling.

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Bibliographic Reference

Kapetanios, G, Khalaf, L and Marcellino, M. 2015. 'Factor based identification-robust inference in IV regressions'. London, Centre for Economic Policy Research. https://cepr.org/active/publications/discussion_papers/dp.php?dpno=10390