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
In Search of the Best Response Scale in a Mixed-mode Survey (Web and Mail): Evidence from MTMM Experiments in the GESIS Panel [journal article]
Source: Methods, data, analyses : a journal for quantitative methods and survey methodology (mda), 15 (2021) 2. p.161-190