Polling experts have zeroed in on a number of reasons that the polls failed to accurately forecast the outcome of the presidential election last November.
The New York Times reports that the subject got a lot of attention this month at the annual conference of the American Association of Public Opinion Research in New Orleans.
“At least three key types of error have emerged as likely contributors to the pro-Clinton bias in pre-election surveys,” The Times reports. “Undecided voters broke for Mr. Trump in the final days of the race, or in the voting booth. Turnout among Mr. Trump’s supporters was somewhat higher than expected. And state polls, in particular, understated Mr. Trump’s support in the decisive Rust Belt region, in part because those surveys did not adjust for the educational composition of the electorate — a key to the 2016 race.”