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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    Moving Without Changing Your Cellphone Number: A Predicament for Pollsters

    By Meredith Dost and Kyley McGeeney Each year about 36 million Americans move residences, according to the Census Bureau. And they quite often take their cellphone numbers with them. Others have not moved but bought their cellphone in a different state. The net result, according to new Pew Research Center estimates, is that 10% of […]

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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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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.