Numbers, Facts and Trends Shaping Your World

Methodological Research

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Public Opinion Polling Basics

By the end of our free, five-lesson course, you will know why we have polls, what the different kinds of polls are, how polling works and what you should look for in a poll.

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    The Whys and Hows of Generations Research

    At the center of the Pew Research Center’s mission is a commitment to measuring public attitudes on key issues and documenting differences in attitudes between demographic and political groups. An individual’s age is one of the most common predictors of differences in attitudes and behaviors. On issues ranging from foreign affairs to social policy, age […]

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    Is It Necessary to Reimburse Cellphone Respondents?

    Respondents who take a Pew Research Center survey on a cellphone are currently offered reimbursement for their cellphone minutes for completing the survey. But is it still necessary in the age of unlimited talk and text?

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    Ukraine 2015: How We Approached Our Sample Design in Light of Insecurity in Eastern Ukraine

    The uneasy ceasefire in eastern Ukraine, punctuated by almost daily fighting between separatists and government forces, posed a major challenge to the Pew Research Center as we set about conducting a new public opinion survey in that country this past spring. As always, our first priority was the safety of interviewers and respondents, who can both be at risk when it comes to face-to-face surveys in a conflict zone.

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Signature Reports

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A Field Guide to Polling: Election 2020 Edition

While survey research in the United States is a year-round undertaking, the public’s focus on polling is never more intense than during the run-up to a presidential election.

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Comparing Two Types of Online Survey Samples

Pew Research Center conducted a study to compare the accuracy of six online surveys of U.S. adults – three from probability-based panels and three from opt-in sources. On average, the absolute error on opt-in samples was about twice that of probability-based panels.

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How Public Polling Has Changed in the 21st Century

A new study found that 61% of national pollsters used different methods in 2022 than in 2016. And last year, 17% of pollsters used multiple methods to sample or interview people – up from 2% in 2016.