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The Cost of Simplifying Preference Models

Author

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  • Michael R. Hagerty

    (GTE Laboratories)

Abstract

Formulas are derived which estimate the accuracy of conjoint analysis in predicting preferences in a validation sample. This accuracy turns out to depend on (among other things) which is used (e.g., whether interactions are added, whether partworth or linear functions are used). I first show a paradoxical result that simpler models often yield higher predictive accuracy, . The reason for this is that the additional parameters of the complex model are estimated with larger variance, which tends to overwhelm the benefits of using the true model. I then shift my criterion from predicting an preferences, to predicting , which is of most interest to managers. Under this criterion my conclusions reverse, and I show that a true model (even when complex) is much more likely to yield higher predictive accuracy than a simpler incorrect model. This reverses some previous conclusions in marketing, and confirms that finding the model of consumer preference is important in improving prediction. Results from four previous empirical papers are correctly predicted by these formulas, as well as results from additional Monte Carlo studies.

Suggested Citation

  • Michael R. Hagerty, 1986. "The Cost of Simplifying Preference Models," Marketing Science, INFORMS, vol. 5(4), pages 298-319.
  • Handle: RePEc:inm:ormksc:v:5:y:1986:i:4:p:298-319
    DOI: 10.1287/mksc.5.4.298
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    Citations

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    Cited by:

    1. Verma, Rohit & Pullman, Madeleine E., 1998. "An analysis of the supplier selection process," Omega, Elsevier, vol. 26(6), pages 739-750, December.
    2. Jan Engelke & Hermann Simon, 2007. "Decision Support Systeme im Marketing," Schmalenbach Journal of Business Research, Springer, vol. 59(1), pages 120-142, February.
    3. Chakraborty, Goutam & Ball, Dwayne & Gaeth, Gary J. & Jun, Sunkyu, 2002. "The ability of ratings and choice conjoint to predict market shares: a Monte Carlo simulation," Journal of Business Research, Elsevier, vol. 55(3), pages 237-249, March.
    4. Baidu-Forson, Jojo & Ntare, Bonny R. & Waliyar, Farid, 1997. "Utilizing conjoint analysis to design modern crop varieties: Empirical example for groundnut in Niger," Agricultural Economics, Blackwell, vol. 16(3), pages 219-226, August.
    5. Park, Chan Su, 2004. "The robustness of hierarchical Bayes conjoint analysis under alternative measurement scales," Journal of Business Research, Elsevier, vol. 57(10), pages 1092-1097, October.

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