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Adaptive Grids for the Estimation of Dynamic Models

Author

Listed:
  • Lanz, Andreas

    (HEC Paris)

  • Reich, Gregor

    (Tsumcor Research AG)

  • Wilms, Ole

    (Tilburg University)

Abstract

This paper develops a method to flexibly adapt interpolation grids of value function approximations in the estimation of dynamic models using either NFXP (Rust, 1987) or MPEC (Su and Judd, 2012). Since MPEC requires the grid structure for the value function approximation to be hard-coded into the constraints, one cannot apply iterative node insertion for grid refinement; for NFXP, grid adaption by (iteratively) inserting new grid nodes will generally lead to discontinuous likelihood functions. Therefore, we show how to continuously adapt the grid by moving the nodes, a technique referred to as r-adaption. We demonstrate how to obtain optimal grids based on the balanced error principle, and implement this approach by including additional constraints to the likelihood maximization problem. The method is applied to two models: (i) the bus engine replacement model (Rust, 1987), modified to feature a continuous mileage state, and (ii) to a dynamic model of content consumption using original data from one of the world’s leading user-generated content networks in the domain of music.

Suggested Citation

  • Lanz, Andreas & Reich, Gregor & Wilms, Ole, 2020. "Adaptive Grids for the Estimation of Dynamic Models," HEC Research Papers Series 1383, HEC Paris.
    • Handle: RePEc:ebg:heccah:1383
    DOI: 10.2139/ssrn.2650994
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    Keywords

    Numerical dynamic programming; mathematical programming with equilibrium constraints; r-adaptive grid refinement; equi-oscillatio;
    All these keywords.

    JEL classification:

    • C25 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Discrete Regression and Qualitative Choice Models; Discrete Regressors; Proportions; Probabilities
    • C63 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - Computational Techniques

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