Survey sampling and estimation methods form the cornerstone of modern statistical inference, underpinning research across the social, medical, and natural sciences. At their heart, these methods ...

This study looks at how national public opinion polling in the United States changed from 2000 to 2022. It focuses on two aspects: the sample source(s) – that is, where the survey takers came from – ...

Amphibian biodiversity is declining worldwide and collecting information about their habitats and populations via monitoring is vital for conservation efforts. However, it is difficult to accurately ...

A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Pew Research Center sometimes employs cognitive interviewing to help improve ...