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| Tekijä: | Schwaiger, M. |
| Otsikko: | Informationsgewinnung aus verzerrten Stichproben |
| Lehti: | Marketing: Zeitschrift fur Forschung und Praxis
1995 : VOL. 17:2, p. 122-129 |
| Asiasana: | MARKET SURVEYS ESTIMATION STATISTICAL METHODS |
| Kieli: | ger |
| Tiivistelmä: | This article deals with estimating expected values from biased samples. A sample consisting of survey-variables, whose expected values in the population are to be estimated, and auxiliary variables, whose mean values are known in the population, serves as a database. We consider a sample biased, if the mean values of the auxiliary variables differ from the respective mean values in the population. In this case classical estimation provides biased point estimators. A parameter extrapolation procedure was focussed that takes bias into account by calculating specific weights for each sample object. Empirical results have shown that weighted estimation provides more precise results than classical estimation does. |
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