MethodsMay 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.

MethodsFebruary 16, 2017

A basic question when reading a poll: Does it include or exclude nonvoters?

Opinion polls in the U.S. can address the same topic yet reach very different results. There are several reasons this can happen, but we tackle one of the most basic: Did the poll include or exclude the 45% who didn’t vote in November?

Fact TankMay 2, 2016

What we learned about online nonprobability polls

The advantages of these online surveys are obvious – they are fast and relatively inexpensive, and the technology for them is pervasive. But are they accurate?