The Pew Research Center conducts public opinion polling in the United States by telephone and, increasingly, online. But these two formats do not always produce identical results. Respondents sometimes answer the same question differently depending on the interview format. It’s called fad, and it’s something we’ve been studying for a few years now.

In our latest Methods 101 video, we take a closer look at fads and review some of the ways survey responses can vary depending on whether respondents are talking to another person on the phone or completing a questionnaire themselves. in line.

Our previous Methods 101 videos explored the differences between nonprobability and probability surveys; the importance of question wording when designing surveys; and how a survey of 1,000 people can tell you what an entire country is thinking. You can watch these videos or visit our methods page to learn more about how we conduct our surveys.

You can also learn more about fashion effects by reading some of our previous research:

Personal finance questions elicit slightly different responses in phone surveys than online

Few fads observed when Americans are asked about their news consumption habits

Do phone polls underestimate support for Trump?

From telephone to web: the challenge of interview mode effects in public opinion polls