Hits 1-2 within 2 documents
Ballpoint pens as incentives with mail questionnaires - results of a survey experiment [journal article]
Source: Methods, data, analyses : a journal for quantitative methods and survey methodology (mda), 10 (2016) 1. p.25-46
Risk of Nonresponse Bias and the Length of the Field Period in a Mixed-Mode General Population Panel [journal article]
Source: Journal of Survey Statistics and Methodology, 10 (2021) 1. p.161-182