By T. Dolan
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Extra resources for Fusion Research - Principles, Experiments and Technology (corr. ed)
Some online directories even offer the possibility to add, modify, and suppress the entries, so that the databases may vary substantially. While some call centers continue to use these directories, especially for marketing purposes, the main survey agencies work with databases from address management companies. They offer continuously updated databases that gather information from a multiplicity of sources, like different directories and commercial customer databases. 8 million individuals, but they do not have a phone number for all of them.
1990). Apart from these biases caused by the different success rates of finding a telephone numbers for various subpopulations response rates differ markedly between subpopulations. In a perfect world these response rate differences would counterbalance the biases from the incomplete frame. This is, alas, not the case. Those groups that are underrepresented in the sample frame are also less likely to respond to a survey request. This is not only the case in the CATI mode but also in other modes (Beukenhorst and Wetzels 2009).
In fact, the problem has two root causes: the growth of mobile connections on the one hand, as we showed previously, and telephone numbers that are not listed in the directory, on the other. In addition, the two factors interact: mobile numbers are listed much less often than are landline numbers. Hence, all the data about phone provisions do not tell us how many households can actually be reached for a telephone survey. 2 The results give some insight into mobile phone use by socio-demographic characteristics.