Hits 251-252 within 252 documents
Advance letters as a way of reducing non-response in a National Health Telephone Survey: differences between listed and unlisted numbers [journal article]
Source: Survey Research Methods, 5 (2011) 3. p.103-116
PIAAC-L: the longitudinal follow-up to PIAAC in Germany [journal article]
Source: Soziale Welt, 73 (2022) 1. p.169-199