Hits 1-2 within 2 documents
Incentives and ethnic minorities: results of a controlled randomized experiment in the Netherlands [journal article]
Source: Survey Research Methods, 2 (2008) 3. p.159-165
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