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Whatever sampling method we use, we will have to confront the problemof non-response to the survey. In pencil-and-paper questionnairesthis takes the form of non-returned questionnaires. The number of unreturnedquestionnaires can often be very substantial with manyquestionnaires receiving response rates well below 50 per cent, and virtuallynone (save small-scale questionnaires completed involuntarily, such
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