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Objective Bayesian model selection approach to the two way analysis of variance

Author

Listed:
  • J. A. Cano

    (Universidad de Murcia)

  • C. Carazo

    (Universidad Católica San Antonio de Murcia)

  • D. Salmerón

    (CIBER Epidemiología y Salud Pública (CIBERESP)
    IMIB-Arrixaca
    Universidad de Murcia)

Abstract

An objective Bayesian procedure for testing in the two way analysis of variance is proposed. In the classical methodology the main effects of the two factors and the interaction effect are formulated as linear contrasts between means of normal populations, and hypotheses of the existence of such effects are tested. In this paper, for the first time these hypotheses have been formulated as objective Bayesian model selection problems. Our development is under homoscedasticity and heteroscedasticity, providing exact solutions in both cases. Bayes factors are the key tool to choose between the models under comparison but for the usual default prior distributions they are not well defined. To avoid this difficulty Bayes factors for intrinsic priors are proposed and they are applied in this setting to test the existence of the main effects and the interaction effect. The method has been illustrated with an example and compared with the classical method. For this example, both approaches went in the same direction although the large P value for interaction (0.79) only prevents us against to reject the null, and the posterior probability of the null (0.95) was conclusive.

Suggested Citation

  • J. A. Cano & C. Carazo & D. Salmerón, 2018. "Objective Bayesian model selection approach to the two way analysis of variance," Computational Statistics, Springer, vol. 33(1), pages 235-248, March.
    • Handle: RePEc:spr:compst:v:33:y:2018:i:1:d:10.1007_s00180-017-0727-1
    DOI: 10.1007/s00180-017-0727-1
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    References listed on IDEAS

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    1. J. Cano & C. Carazo & D. Salmerón, 2013. "Bayesian model selection approach to the one way analysis of variance under homoscedasticity," Computational Statistics, Springer, vol. 28(3), pages 919-931, June.
    2. Juan Cano & Mathieu Kessler & Elías Moreno, 2004. "On intrinsic priors for nonnested models," TEST: An Official Journal of the Spanish Society of Statistics and Operations Research, Springer;Sociedad de Estadística e Investigación Operativa, vol. 13(2), pages 445-463, December.
    3. Cano, J.A. & Carazo, C. & Salmerón, D., 2016. "Linear contrasts for the one way analysis of variance: A Bayesian approach," Statistics & Probability Letters, Elsevier, vol. 109(C), pages 54-62.
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