Abstract
There are several reasons to consider mixed-mode data collection procedures in survey sampling. De Leeuw (2005) emphasized that mixing modes of data collection can improve data quality and response rates, since the disadvantages of one mode can be compensated with the advantages of other modes. A second driving force behind mixed-mode designs is the reduction of administration costs of a survey. Cost is an important limiting factor in survey research and is the main reason that the Dutch Integrated Safety Monitor (ISM) employs a sequential mixed-mode strategy using web interviewing (WI), paper and pencil interviewing (PAPI), computer assisted telephone interviewing (CATI) and computer assisted personal interviewing (CAPI). While CAPI is the most costly mode, it is applied in the ISM to reach subpopulations traditionally known to be difficult to contact through the other modes. The ISM has now been conducted twice. In this paper the importance of including CAPI is assessed. It is investigated how sensitive the representativity of the response and the survey outcomes are to omission of the CAPI mode.
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