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Fitting a Mixture Distribution to a Variable Subject to Heteroscedastie Measurement Errors

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  • Markus Thamerus

    (University of Munich)

Abstract

Summary In a structural errors-in-variables model the true regressors are treated as stochastic variables that can only be measured with an additional error. Therefore the distribution of the latent predictor variables and the distribution of the measurement errors play an important role in the analysis of such models. In this article the conventional assumptions of normality for these distributions are extended in two directions. The distribution of the true regressor variable is assumed to be a mixture of normal distributions and the measurement errors are again taken to be normally distributed but the error variances are allowed to be heteroscedastie. It is shown how an EM algorithm solely based on the error-prone observations of the latent variable can be used to find approximate ML estimates of the distribution parameters of the mixture. The procedure is illustrated by a Swiss data set that consists of regional radon measurements. The mean concentrations of the regions serve as proxies for the true regional averages of radon. The different variability of the measurements within the regions motivated this approach.

Suggested Citation

  • Markus Thamerus, 2003. "Fitting a Mixture Distribution to a Variable Subject to Heteroscedastie Measurement Errors," Computational Statistics, Springer, vol. 18(1), pages 1-17, March.
    • Handle: RePEc:spr:compst:v:18:y:2003:i:1:d:10.1007_s001800300129
    DOI: 10.1007/s001800300129
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    References listed on IDEAS

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    1. Kiefer, Nicholas M, 1978. "Discrete Parameter Variation: Efficient Estimation of a Switching Regression Model," Econometrica, Econometric Society, vol. 46(2), pages 427-434, March.
    2. Dankmar Böhning & Ekkehart Dietz & Rainer Schaub & Peter Schlattmann & Bruce Lindsay, 1994. "The distribution of the likelihood ratio for mixtures of densities from the one-parameter exponential family," Annals of the Institute of Statistical Mathematics, Springer;The Institute of Statistical Mathematics, vol. 46(2), pages 373-388, June.
    3. Sylvia. Richardson & Peter J. Green, 1997. "On Bayesian Analysis of Mixtures with an Unknown Number of Components (with discussion)," Journal of the Royal Statistical Society Series B, Royal Statistical Society, vol. 59(4), pages 731-792.
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    1. Delaigle, Aurore & Meister, Alexander, 2007. "Nonparametric Regression Estimation in the Heteroscedastic Errors-in-Variables Problem," Journal of the American Statistical Association, American Statistical Association, vol. 102, pages 1416-1426, December.
    2. Carroll, Raymond J. & Delaigle, Aurore & Hall, Peter, 2009. "Nonparametric Prediction in Measurement Error Models," Journal of the American Statistical Association, American Statistical Association, vol. 104(487), pages 993-1003.

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