Testing Nine Hypotheses About Quota Sampling

Elinor Scarbrough and Catherine Marsh

Hypotheses about bias in quota samples, drawn from previous literature, are tested with data from a survey in which half the interviews were secured by random sampling and half by quota.
  

Testing Nine Hypotheses about Quota Sampling

Catherine Marsh  University of Manchester  andElinor Scarbrough University of Essex

INTRODUCTION

Since Moser and Stuart's pioneering work (Moser and Stuart 1953), systematic investigation of random and quota sampling has fallen into abeyance amongst British researchers.1In the USA, the development of 'probability sampling with quotas', or PSQ (Sudman 1966, 1976; Stephenson 1978) appears to have put an end to the debate about probability and quota sampling which followed the 1948 Presidential election. In Britain, however, the research community is more divided about sampling practice, with market...

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