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Why Well Spread Probability Samples Are Balanced

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DOI: 10.4236/ojs.2013.31005    3,724 Downloads   5,968 Views   Citations

ABSTRACT

When sampling from a finite population there is often auxiliary information available on unit level. Such information can be used to improve the estimation of the target parameter. We show that probability samples that are well spread in the auxiliary space are balanced, or approximately balanced, on the auxiliary variables. A consequence of this balancing effect is that the Horvitz-Thompson estimator will be a very good estimator for any target variable that can be well approximated by a Lipschitz continuous function of the auxiliary variables. Hence we give a theoretical motivation for use of well spread probability samples. Our conclusions imply that well spread samples, combined with the Horvitz- Thompson estimator, is a good strategy in a varsity of situations.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

A. Grafström and N. Lundström, "Why Well Spread Probability Samples Are Balanced," Open Journal of Statistics, Vol. 3 No. 1, 2013, pp. 36-41. doi: 10.4236/ojs.2013.31005.

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