Hits 1-2 within 2 documents
Coverage- and Nonresponse-Effekte bei Online-Bevölkerungsumfragen [collection article]
Source: VS Verl. für Sozialwiss., 2009
Prenotification in web-based access panel surveys: the influence of mobile text messaging versus e-mail on response rates and sample composition [journal article]
Source: Social Science Computer Review, 26 (2008) 2. p.213-223