MethodsFebruary 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.

Pew Research CenterFebruary 6, 2019

How highly religious Americans view evolution depends on how they’re asked about it

Evolution remains a contentious issue. When asked about it, highly religious Americans’ responses can vary depending on how the question is asked.

Pew Research CenterJanuary 29, 2019

‘Good jobs’ vs. ‘jobs’: Survey experiments can measure the effects of question wording – and more

The way polling questions are asked can influence people’s answers. Survey experiments are one way to measure the degree to which different questions elicit different answers.

MethodsDecember 6, 2018

How asking about your sleep, smoking or yoga habits can help pollsters verify their findings

Pew Research Center uses benchmarking questions to ensure our surveys are accurate. Learn why and how we use these questions.

Pew Research CenterOctober 18, 2018

‘Defining the universe’ is essential when writing about survey data

Given the wide range of people we speak to for our polls – and the issues we ask them about – it’s important to be as clear as possible about exactly who says what. In research circles, this practice is sometimes called “defining the universe.”

Pew Research CenterAugust 6, 2018

What are nonprobability surveys?

Many online surveys are conducted using “nonprobability” or “opt-in” samples, which are generally easier and cheaper to conduct. In our latest Methods 101 video, we explore some of the features of nonprobability surveys and how they differ from traditional probability-based polls.

Pew Research CenterMay 14, 2018

Can we still trust polls?

Donald Trump’s victory in 2016 and the U.K. “Brexit” decision rattled public confidence in polls. Our new video explains why well-designed polls can be trusted.

Pew Research CenterApril 19, 2018

Q&A: How Pew Research Center identified bots on Twitter

For a recent study on automated accounts and Twitter, we had to answer a fundamental question: Which accounts are bots and which accounts aren’t? Read a Q&A with Stefan Wojcik, a computational social scientist at the Center and one of the report’s authors, on how he and his colleagues navigated this question.

Pew Research CenterApril 9, 2018

5 things to know about bots on Twitter

Read key findings and watch a video about our new study on how bot accounts affect the mix of content on Twitter.

Pew Research CenterMarch 21, 2018

How do you write survey questions that accurately measure public opinion?

In the second video from our Methods 101 series, we’re tackling why question wording is so important in public opinion surveys.