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Statistical inference for Markov processes when the model is incorrect

Published online by Cambridge University Press:  01 July 2016

Robert V. Foutz  and
R. C. Srivastava
Robert V. Foutz*
Affiliation:
Virginia Polytechnic Institute and State University
R. C. Srivastava*
Affiliation:
The Ohio State University
*
∗Postal address: Department of Statistics and Statistical Laboratory, Virginia Polytechnic Institute and State University, Blacksburg VA24061, U.S.A.
∗∗Postal address: Department of Statistics, The Ohio State University, Cockins Hall, 1958 Neil Avenue, OH 43210, U.S.A.
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Abstract

Statistical inference for Markov processes is commonly based on the maximum likelihood method of estimation and the likelihood ratio criterion for testing hypotheses. Construction of estimators and test statistics by these methods require that a model be chosen in the form of a family of transition density functions. In this paper, asymptotic properties of the maximum likelihood estimator and of the likelihood ratio statistic λn are examined when the model chosen for their construction is incorrect—that is, when no density in the model is a density for the transition probability distribution of the Markov process. It is shown that if and λn are constructed from a ‘regular’ incorrect model, then is consistent and asymptotically normally distributed and the asymptotic null distribution of −2 log λn is that of a linear combination of independent chi-squared random variables. These results are applied to propose measures of the performance of the test based on λn when the statistic is constructed from an incorrect model.

Keywords

MARKOV PROCESSESINCORRECT MODELMAXIMUM LIKELIHOOD ESTIMATORLIKELIHOOD RATIO TESTBAHADUR EFFICIENCY
Type
Research Article
Information
Advances in Applied Probability , Volume 11 , Issue 4 , December 1979 , pp. 737 - 749
Copyright
Copyright © Applied Probability Trust 1979 

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