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    Evaluating Online Nonprobability Surveys

    Online nonprobability surveys are fast, cheap, and increasingly popular. We compared nine samples and found that accuracy varied substantially.

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    3. Demographic, political and interest profiles

    Many nonprobability sample vendors have the ability to provide samples of respondents that, by design, are forced to align with characteristics of the U.S. population. Often those characteristics are demographics such as gender and age, though some vendors also use nondemographic variables. When a vendor forces the sample to match the population on a particular […]

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