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Econometric Modeling as Information Aggregation

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  • Ray C. Fair
  • Robert J. Shiller

Abstract

A forecast produced by an econometric model is a weighted aggregate of predetermined variables in the model. In many models the number of predetermined variables used is very large, often exceeding the number of observations. A method is proposed in this paper for testing an econometric model as an aggregator of the information in these predetermined variables relative to a specified subset of them. The test, called the "information aggregation" (IA) test, tests whether the model makes effective use of the information in the predetermined variables or whether a smaller information set carries as much information. The method can also be used to test one model against another. The method is used to test the Fair model as an information aggregator. The Fair model is also tested against two relatively non theoretical models: a VAR model and an "autoregressive components" (AC) model. The AC model, which is new in this paper, estimates an autoregressive equation for each component of real GNP, with real GNP being identically determined as the sum of the components. The results show that the AC model dominates the VAR model, although both models are dominated by the Fair model. The results also show that the Fair model seems to be a good information aggregator.

Suggested Citation

  • Ray C. Fair & Robert J. Shiller, 1987. "Econometric Modeling as Information Aggregation," NBER Working Papers 2233, National Bureau of Economic Research, Inc.
  • Handle: RePEc:nbr:nberwo:2233 Note: EFG
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    11. Engle, Robert & Granger, Clive, 2015. "Co-integration and error correction: Representation, estimation, and testing," Applied Econometrics, Publishing House "SINERGIA PRESS", vol. 39(3), pages 106-135.
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    Cited by:

    1. Robert J. Shiller, 1987. "Ultimate Sources of Aggregate Variability," Cowles Foundation Discussion Papers 816, Cowles Foundation for Research in Economics, Yale University.
    2. Ray C. Fair, 1987. "VAR Models as Structural Approximations," Cowles Foundation Discussion Papers 856R, Cowles Foundation for Research in Economics, Yale University, revised Mar 1989.
    3. Bentour, El Mostafa, 2015. "A ranking of VAR and structural models in forecasting," MPRA Paper 61502, University Library of Munich, Germany.

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