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Implementing a strategy to reduce the instrument count in panel GMM

Author

Listed:
  • Maria Elena Bontempi

    (University of Bologna)

  • Irene Mammi

    (University of Bologna)

Abstract

The problem of instrument proliferation and its consequences— overfitting of the endogenous explanatory variables, biased instrumental-variables and generalized method of moments estimators, and weakening of the power of the overidentification tests—are well known. This article introduces a statistical method to reduce the instrument count. Principal component analysis is applied on the instrument matrix, and the principal-component analysis scores are used as instruments for the panel generalized method of moments estimation. This strategy is implemented through the new command pca2. Copyright 2015 by StataCorp LP.

Suggested Citation

  • Maria Elena Bontempi & Irene Mammi, 2015. "Implementing a strategy to reduce the instrument count in panel GMM," Stata Journal, StataCorp LP, vol. 15(4), pages 1075-1097, December.
    • Handle: RePEc:tsj:stataj:v:15:y:2015:i:4:p:1075-1097
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    Cited by:

    1. Njamen Kengdo Arsène Aurelien & Nchofoung Tii N. & Kos A Mougnol Alice, 2023. "Determinants of Military Spending in Africa: Do Institutions Matter?," Peace Economics, Peace Science, and Public Policy, De Gruyter, vol. 29(4), pages 401-440, December.
    2. Joshy Easaw & Roberto Golinelli, 2022. "Professionals Inflation Forecasts: The Two Dimensions Of Forecaster Inattentiveness [“Sectoral and aggregate inflation dynamics in the euro area”]," Oxford Economic Papers, Oxford University Press, vol. 74(3), pages 701-720.
    3. R. Golinelli & I. Mammi & A. Musolesi, 2018. "Parameter heterogeneity, persistence and cross-sectional dependence: new insights on fiscal policy reaction functions for the Euro area," Working Papers wp1120, Dipartimento Scienze Economiche, Universita' di Bologna.
    4. Bayar, Omer, 2018. "Weak instruments and estimated monetary policy rules," Journal of Macroeconomics, Elsevier, vol. 58(C), pages 308-317.
    5. Bontempi, Maria Elena & Bottazzi, Laura & Golinelli, Roberto, 2020. "A multilevel index of heterogeneous short-term and long-term debt dynamics," Journal of Corporate Finance, Elsevier, vol. 64(C).
    6. Masca, Simona-Gabriela & Chis, Diana-Maria, 2023. "Distributional implications of informal economy in the EU countries: Accounting for the spread of tax evasion benefits and cultural characteristics," Socio-Economic Planning Sciences, Elsevier, vol. 87(PB).

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