Scott Keeter

Pew Research Center’s American Trends Panel (ATP) is now the Center’s principal source of data for U.S. public opinion research.

Pew Research Center makes most of its datasets available for download once reporting has been completed for a given study. Here's how to find and access our data.

In the aftermath of presidential debates, there is intense interest in gauging "who won." How can we know the answer to that question?

With 89% of U.S. adults online, survey research is rapidly moving to the Web. But 89% is not 100%, and surveys that include only those who use the internet run the risk of producing biased results.

With response rates low and heading lower, how can survey researchers have confidence in their findings? Scott Keeter, director of survey research at Pew Research Center, addresses this issue and related questions.

A Pew Research Center experiment found several key areas where Web surveys produced different results than those conducted by phone.

Among the most striking trends in the field of survey research in the past two decades is the shift from interviewer-administered to self-administered surveys. Fueled by the growth of the internet, self-administration as a survey mode presents a mixture of opportunities and challenges to the field.

An estimated 46.5% of U.S. adults are cell-only today. To keep pace with this trend, the Pew Research Center will increase the percentage of respondents interviewed on cellphones in its typical national telephone surveys to 65%.

The goal of the political typology is to sort people into homogeneous groups, based on their political values and attitudes. It’s an effort to categorize people politically to help us better understand the complexities of the current political landscape.

In the coming months, 60% of interviews in our national polls will be conducted via cellphones and 40% on landline phones.