FiveThirtyEight media bias rating is Center.

FiveThirtyEight is believed to have a center bias rating. Although it formed a partnership with the New York Times, which has a lean left bias, for three years, the AllSides Bias Rating™ for the website remains center. Currently, FiveThirtyEight is owed ESPN. The wesbite has been criticized by several pundits for a perceived left-leaning bias. One of those authors was Dean Chambers, who accused Silver of pro-Obama biases during the 2012 Presidential election after Silver gave Obama a 73 percent chance of re-election. Ultimately, FiveThirtyEight’s prediction model correctly predicted the results in all 50 states, while coming within 0.3 percent of accurately predicting Obama’s popular vote percentage. The website has generally been recognized as a highly accurate, unbiased source for political projections since 2008, though it has gone through some controversy during the 2016 election cycle. As early as June 2015, FiveThirtyEight argued that Donald Trump “isn’t a real candidate” and gave him extremely slim odds of winning the nomination. After Trump became the presumptive nominee in May 2016, Silver published a retrospective “How I Acted Like a Pundit and Screwed Up on Donald Trump.” Meanwhile, FiveThirtyEight was accused of lacking objectivity by media watch group Fairness and Accuracy in Reporting after providing pessimistic predictions for Bernie Sanders’ success in the Democratic primaries.

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FiveThirtyEight founder Nate Silver considers the website primarily focused on data journalism rather than politics, with five major sections comprising the site’s content: politics, economics, science, life and sports. Silver gained notoriety after predicting publishing a highly accurate primary election prediction under the pseudonym "Poblano." Silver predicted Barack Obama would win 859 delegates in the 2008 Democratic primary, and Hillary Clinton 829, with the results ultimately coming in at 847 delegates for Obama and 834 for Clinton.

Sources:

Wikipedia: FiveThirtyEight

FiveThirtyEight

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The AllSides Media Bias Rating reflects the average judgment of the American people.

The AllSides Media Bias RatingTM reflects the average judgment of the American people. We don't use a convoluted mathematical or artificial intelligence model, but instead have regular people representing the broad spectrum of Americans blindly rate the bias of articles. That produces a fair, verifiable bias rating.

This media bias rating was determined using the following levels of bias verification.

Basis of Rating:

Blind Survey
Third Party Data
0
Community Feedback
0
Editorial Review
1
Secondary Research

Confidence Level:

Low or Initial Rating

Unless otherwise noted, this bias rating refers only to news articles on their web site, not from opinion pieces or what is broadcasted on TV or radio. The opinion writers from the same media source may have different bias ratings, so individual writers often are rated separately.