15. Why we revised our estimates for 2010
Read how Pew Research Center revised our estimates to reflect methodological advances, incorporate newly available data, and allow comparison across measures in this report.
Numbers, Facts and Trends Shaping Your World
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Methodology B: Survey data on immigrants
This report presents estimates of the number of unauthorized immigrants in the United States as of July 2023 and for earlier years. As noted earlier in this report, the estimates presented here supersede all previously published Pew Research Center estimates. The principal survey data used to produce the estimates and modifications made to the underlying […]
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report
Appendix: Political categorization
For this analysis, we grouped people into two political categories: those who support the governing political party (or parties) in their country, and those who do not. These categories were coded based on the party or parties in power at the time the survey was fielded and on respondents’ answers to a question asking which […]
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Methodology
About Pew Research Center’s Spring 2025 Global Attitudes Survey Results for the survey are based on a mix of telephone, face-to-face and online interviews conducted under the direction of Gallup, Langer Research Associates and Social Research Centre. The results are based on national samples unless otherwise noted. Read more about our international survey methodology and […]
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decoded
How adding a ‘Don’t know’ response option can affect cross-national survey results
In our surveys, people are much less likely to skip questions online than when speaking to interviewers in person or on the phone; we explore how offering a “Don’t know” option in online surveys affects results.
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Appendix D: Political categorization
For this analysis, we grouped people into two political categories: those who identify with the governing political party (or parties) in their country, and those who do not. These categories were coded based on the party or parties in power at the time the survey was fielded and on respondents’ answers to a question asking […]
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Methodology
This report aims to gain an understanding of social media influencers who focus on health and wellness topics and the experience of U.S. adults who get such information from these influencers. It uses two different methodologies, including an analysis of health and wellness influencers who regularly post on Instagram, TikTok or YouTube, as well as […]
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short reads
5 facts about Buddhists in the United States
Today, there are millions of Buddhists in the United States, including many who were born to Buddhist families and others who converted into the religion.
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report
Methodology
About Pew Research Center’s Spring 2024 Global Attitudes Survey Results for the survey are based on telephone, face-to-face and online interviews conducted under the direction of Gallup, Langer Research Associates, Social Research Centre and Verian. The results are based on national samples, unless otherwise noted. Here are more details about our international survey methodology and country-specific […]
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report
Appendix A: Survey methodology
About Pew Research Center’s Spring 2025 Global Attitudes Survey Results for the survey are based on a mix of telephone, face-to-face and online interviews conducted under the direction of Gallup, Langer Research Associates and Social Research Centre. The results are based on national samples, unless otherwise noted. Read more about our international survey methodology and […]
