Market, Opinion and Social Research is increasingly relying on non-probabilistic online panels as data sources and quota sampling as the default sampling method. Quota sampling applied to online panels requires discarding participants to ensure that the final sample match the target population distribution. This article analyzes how different features of a quota sample (such as the sample size, number, and types of quotas) impact the number of participants that must be discarded during the data collection (fieldwork efficiency). Both analytical models and simulation have been used for this purpose. Finally, we show how uncertainty about participants relates to fieldwork efficiency, providing practical recommendations in pursuing this goal.
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Ochoa et al. (2018) studied this question.
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