short readsFeb 7, 2019 Phone vs. online surveys: Why do respondents’ answers sometimes differ by mode? Pew Research Center conducts surveys over the phone and, increasingly, online. But these two formats don’t always produce identical results.
short readsMay 12, 2017 How can a survey of 1,000 people tell you what the whole U.S. thinks? The first video in our “Methods 101” series is about random sampling, a concept that undergirds all probability-based survey research. Here’s how it works.