BMC Medical Research Methodology · 2019 · 117 citations · 44 references
Pre-issued cash incentives and sending follow-up waves could maximize the representativeness and numbers of people from which to recruit, and may be an effective strategy for improving recruitment into field studies.
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Nonresponse Rates and Nonresponse Bias in Household Surveys
Robert M. Groves · Public Opinion Quarterly · 2006 · 2.4K citations