Can a non-probabilistic online panel achieve question quality similar to that of the European Social Survey?

Recently, Revilla and Saris (2012) showed, using data from the Netherlands, that the quality of responses (product of reliability and validity) in a probability-based online panel (LISS) can be similar to those from face-to-face surveys (European Social Survey round 4).

Can a non-probabilistic online panel achieve question quality similar to that of the European Social Survey?

Melanie Revilla and Willem Saris

RECSM, Universitat Pompeu Fabra

Germán Loewe and Carlos Ochoa

Netquest

Introduction

Online surveys are becoming more and more common. They are present in many different forms: different lengths, different topics, different ways of proposing the survey to the respondents (e.g. banner, emails, opt-in surveys versus by invitation only surveys), different objectives (e.g. improving products, selling more, knowing behaviours, opinions or attitudes), different incentives systems (e.g. money, presents, points), different ways of getting...

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