Online opt-in polls can produce misleading results, especially for young people and Hispanic adults
We examine how an opt-in poll may have unintentionally misled the public about the sensitive issue of Holocaust denial among young Americans.
Andrew Mercer is a senior research methodologist at Pew Research Center. He is an expert on probability-based online panels, nonprobability survey methods, survey nonresponse and statistical analysis. His research focuses on methods of identifying and correcting bias in survey samples. He leads the Centerโs research on nonprobability samples and co-authored severalย reportsย andย publicationsย on the subject. He also served on the American Association for Public Opinion Researchโs task force on Data Quality Metrics for Online Samples. He has authored blog posts and analyses making methodological concepts such asย margin of errorย andย oversamplingย accessible to a general audience. Prior to joining the Center, Mercer was a senior survey methodologist at Westat. He received a bachelorโs degree in political science from Carleton College and masterโs and doctoral degrees in survey methodology from the University of Maryland. His research has been published in Public Opinion Quarterly and the Journal of Survey Statistics and Methodology.
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