A Note on the Theme of Too Many Instruments

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How researchers see this paper

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Democracy, Political Risks and Stock Market Performance (2015, positive): “Roodman (2009) provides examples and argues that the high number of instruments can generate both invalid”
The Impact of Terrorism on Governance in African Countries (2017, background): “Therefore, the gmmstyle is adopted for them and only years are treated as exogenous and the approach for treating the ivstyle (years) is ‘iv(years, eq(diff))’ because it is not possible for the years to become endogenous in first-difference (see Roodman, 2009b).”
Development Aid and Economic Growth: A Positive Long-Run Relation (2009, positive): “20 A cautionary note is in order, as a relatively high number of instruments may lead to overfitting of the endogenous variables and could weaken the Hansen test of instruments’ joint validity (Roodman, 2009).”
Does government ideology influence budget composition? Empirical evidence from OECD countries (2010, background): “instruments (see Roodman 2006, 2009 for further details).”
Inflation and growth: new evidence from a dynamic panel threshold analysis (2009, neutral): “Empirical results may depend on the number (p) of instruments (see Roodman (2009)).”