One possible explanation for the variability in estimates across the different nonprobability samples is the range of methods that online sample vendors employ. They differ on recruitment, weighting ...

With a population of over 40 million users worldwide, a number doubling every year, the internet has become a medium with distinct business opportunities. To academic and commercial researchers, the ...

Across all social science disciplines, but in particular public administration, there is a shared concern about the costs of using traditional random samples to generate data, and its impact on ...

Web surveys can be conducted relatively fast and at relatively low cost. However, Web surveys are often conducted with nonprobability samples and, therefore, a major concern is generalizability. There ...

You can't do this with non-probability sampling methods. 2. Discuss the main types of probability sampling methods and explain their strengths and weaknesses. If you construct your sample by randomly ...

This study reports the findings of a comparison between different non-probability sampling methods applied in a WWW-user-survey.