Numbers, Facts and Trends Shaping Your World

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    Methodology

    The American Trends Panel survey methodology The American Trends Panel (ATP), created by Pew Research Center, is a nationally representative panel of randomly selected U.S. adults. Panelists participate via self-administered web surveys. Panelists who do not have internet access at home are provided with a tablet and wireless internet connection. The panel is being managed […]

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    Alexandra Castillo

    Alexandra Castillo is a research methodologist in international research methods at Pew Research Center. She advises on complex sample design, survey implementation, and data quality assessment for international projects across the Center. Alexandra received her doctorate in political science at the Ohio State University, where she specialized in comparative politics and political psychology. She regularly […]

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    Appendix: Survey methodology

    The random-digit-dial survey (RDD) was conducted according to Pew Research Center’s standard protocol for RDD surveys. Interviewing occurred April 25 through May 1, 2018, with 1,503 adults living in the U.S., including 376 respondents on a landline telephone (25% of the total) and 1,127 on a cellphone (75%). The parallel registration-based sampling survey interviewed 1,854 […]