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The effect of incentives on response rates and panel attrition: results of a controlled experiment [journal article]
Source: Survey Research Methods, 2 (2008) 3. p.151-158
Are incentive effects on response rates and nonresponse bias in large-scale, face-to-face surveys generalizable to Germany? Evidence from ten experiments [journal article]
Source: Public Opinion Quarterly, 79 (2015) 3. p.740-768