Methodological analysis reveals significant biasing effects from questionnaire administration modes, indicating substantial risks to data validity and public policy decisions.
The biasing effects of mode of questionnaire administration has important implications for research methodology, the validity of the results of research, and for the soundness of public policy developed from evidence using questionnaire-based research. All users of questionnaires need to be aware of these potential effects on their data.
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Ann Bowling (2005) studied this question.
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