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The Identification of Time-Invariant Variables in Panel Data Model: Exploring the Role of Science in Firms’ Productivity

Author

Listed:
  • Amoroso, Sara

    (DIW Berlin)

  • Bruno, Randolph Luca

    (University College London)

  • Magazzini, Laura

    (Sant'Anna School of Advanced Studies)

Abstract
Recent literature has raised the attention on the estimation of time-invariant variables both in a static and a dynmamic framework. In this context, Hausman-Taylor type estimators have been applied, relying crucially on the distinction between exogenous and endogenous variables (in terms of correlation with the time-invariant error component). We show that this provision can be relaxed, and identification can be achieved by relying on the milder assumption that the correlation between the individual effect and the time-varying regressors is homogenous over time. The methodology is applied to identify the role of inputs from "Science" (firm-level publications' stock) on firms' labour productivity, showing that the effect is larger for those firms with higher level of R&D investments. The results further support the dual – direct and indirect – role of R&D.

Suggested Citation

  • Amoroso, Sara & Bruno, Randolph Luca & Magazzini, Laura, 2022. "The Identification of Time-Invariant Variables in Panel Data Model: Exploring the Role of Science in Firms’ Productivity," IZA Discussion Papers 15708, Institute of Labor Economics (IZA).
    • Handle: RePEc:iza:izadps:dp15708
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    References listed on IDEAS

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    More about this item

    Keywords

    panel data; time-invariant variables; science; productivity; R&D;
    All these keywords.

    JEL classification:

    • C23 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Models with Panel Data; Spatio-temporal Models
    • O32 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights - - - Management of Technological Innovation and R&D
    • L20 - Industrial Organization - - Firm Objectives, Organization, and Behavior - - - General

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