Using auxiliary information in statistical function estimation
ESAIM: Probability and Statistics, Tome 10 (2006), pp. 11-23.

In many practical situations sample sizes are not sufficiently large and estimators based on such samples may not be satisfactory in terms of their variances. At the same time it is not unusual that some auxiliary information about the parameters of interest is available. This paper considers a method of using auxiliary information for improving properties of the estimators based on a current sample only. In particular, it is assumed that the information is available as a number of estimates based on samples obtained from some other mutually independent data sources. This method uses the fact that there is a correlation effect between estimators based on the current sample and auxiliary information from other sources. If variance covariance matrices of vectors of estimators used in the estimating procedure are known, this method produces more efficient estimates in terms of their variances compared to the estimates based on the current sample only. If these variance-covariance matrices are not known, their consistent estimates can be used as well such that the large sample properties of the method remain unchangeable. This approach allows to improve statistical properties of many standard estimators such as an empirical cumulative distribution function, empirical characteristic function, and Nelson-Aalen cumulative hazard estimator.

DOI : 10.1051/ps:2005019
Classification : 62G05, 62G20
Mots clés : auxiliary information, multiple data sources, partially grouped samples, convergence rates 
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Tarima, Sergey; Pavlov, Dmitri. Using auxiliary information in statistical function estimation. ESAIM: Probability and Statistics, Tome 10 (2006), pp. 11-23. doi : 10.1051/ps:2005019. http://www.numdam.org/articles/10.1051/ps:2005019/

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