Unplanned domain structure

A domain is defined unplanned, if the domain sample size nsd is not fixed in the sampling design. This is the case in which the desired domain structure is not a part of the sampling design. Thus, the domain sample sizes are random quantities introducing an increase in the variance estimates of domain estimators. In addition, an extremely small number (even zero) of sample elements in a domain can be realized in this case, if the domain size in the population is small. See pages 188-190 in Lehtonen, R & Pahkinen, E. (2004)

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