Courtney Kennedy

Many who follow polls are asking how these errors could happen. Here, we’ll take a preliminary shot at answering that question.

If a battleground state poll does not adjust for having too many college graduates, it is at risk of overstating support for a Democratic presidential candidate. The Current Population Survey provides high-quality data that can mitigate overrepresentation of college graduates.

The real environment in which polls are conducted bears little resemblance to the idealized settings presented in textbooks.

The rise of internet polling makes it more feasible to publish estimates for Asian Americans. But these estimates offer a limited view.

We explain the basics of machine learning – using computer programs to identify patterns in data – and how it allows researchers at the Center to analyze data on a large scale.

While the growth of online interviewing is a prominent trend in polling, there is variation within that trend in how researchers recruit respondents. This study finds that sourcing affects data quality.

While survey research in the United States is a year-round undertaking, the public’s focus on polling is never more intense than during the run-up to a presidential election.

While the notion that polls should include equal numbers of Republicans and Democrats makes some sense, it’s based on a misunderstanding of what polling is intended to do.

The Center conducts polls in many countries other than the U.S. – but the methodology behind our international surveys can vary.

when designing an online survey questionnaire, there is more than one way to ask a respondent to select which options in a series applies to them.