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Econometric Modeling of Business Telecommunications Demand using RETINA and Finite Mixtures

Author

Listed:
  • Massimiliano Marinucci

    (Universidad Complutense Madrid)

  • Teodosio Pérez-Amaral

    (Universidad Complutense Madrid)

Abstract

In this paper we estimate the business telecommunications demands for local,intra-LATA and inter-LATA services, using US data from a Bill Harvesting (R) survey carried out during 1997. We model heterogeneity, which is present among firms due to a variety of different business telecommunication needs, by estimating normal heteroskedastic mixture regressions. The results show that a three-component mixture model fits the demand for local services well, while a two-component structure is used to model intra-LATA and inter-LATA demand. We characterize the groups in terms of their differences among the coefficients, and then use RETINA to perform automatic model selection over an expanded candidate regressor set which includes heterogeneity parameters as well as transformations of the original variables. Our models improve substantially the in-sample fit as well the out-of-sample predictive ability over alternative candidate models. RETINA suggests that the final demand specification should include telephone equipment variables as relevant regressors. On the other hand, the output of the firm, as well as its physical extension, have second order, yet significant effects on the demand for telecommunication services. Estimated elasticities are different for the three demands but always positive for access form (single-line or private network).

Suggested Citation

  • Massimiliano Marinucci & Teodosio Pérez-Amaral, 2005. "Econometric Modeling of Business Telecommunications Demand using RETINA and Finite Mixtures," Econometrics 0505003, EconWPA, revised 16 May 2005.
  • Handle: RePEc:wpa:wuwpem:0505003
    Note: Type of Document - pdf; pages: 39
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    References listed on IDEAS

    as
    1. Teodosio Perez-Amaral & Giampiero M. Gallo & Halbert White, 2003. "A Flexible Tool for Model Building: the Relevant Transformation of the Inputs Network Approach (RETINA)," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 65(s1), pages 821-838, December.
    2. White, Halbert, 1980. "A Heteroskedasticity-Consistent Covariance Matrix Estimator and a Direct Test for Heteroskedasticity," Econometrica, Econometric Society, vol. 48(4), pages 817-838, May.
    3. Jeffrey Rohlfs, 1974. "A Theory of Interdependent Demand for a Communications Service," Bell Journal of Economics, The RAND Corporation, vol. 5(1), pages 16-37, Spring.
    Full references (including those not matched with items on IDEAS)

    More about this item

    Keywords

    Telecommunication Demand Models; Local calls; inter-LATA calls; intra-LATA calls; RETINA; Flexible Functional Forms; Heterogeneity; Finite Mixtures.;

    JEL classification:

    • C21 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Cross-Sectional Models; Spatial Models; Treatment Effect Models
    • C51 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Model Construction and Estimation
    • C52 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Model Evaluation, Validation, and Selection

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