Department of Economics
579 Serra Mall
Stanford, CA 94305
Institutional Affiliation: Stanford University
NBER Working Papers and Publications
|November 2019||Selection with Variation in Diagnostic Skill: Evidence from Radiologists|
with David C. Chan Jr, Matthew Gentzkow: w26467
Physicians, judges, teachers, and agents in many other settings differ systematically in the decisions they make when faced with similar cases. Standard approaches to interpreting and exploiting such differences assume they arise solely from variation in preferences. We develop an alternative framework that allows variation in both preferences and diagnostic skill, and show that both dimensions are identified in standard settings under quasi-random assignment. We apply this framework to study pneumonia diagnoses by radiologists. Diagnosis rates vary widely among radiologists, and descriptive evidence suggests that a large component of this variation is due to differences in diagnostic skill. Our estimated model suggests that radiologists view failing to diagnose a patient with pneumonia as...
|January 2019||Trends in the Diffusion of Misinformation on Social Media|
with Hunt Allcott, Matthew Gentzkow: w25500
In recent years, there has been widespread concern that misinformation on social media is damaging societies and democratic institutions. In response, social media platforms have announced actions to limit the spread of false content. We measure trends in the diffusion of content from 569 fake news websites and 9,540 fake news stories on Facebook and Twitter between January 2015 and July 2018. User interactions with false content rose steadily on both Facebook and Twitter through the end of 2016. Since then, however, interactions with false content have fallen sharply on Facebook while continuing to rise on Twitter, with the ratio of Facebook engagements to Twitter shares decreasing by 60 percent. In comparison, interactions with other news, business, or culture sites have followed similar...
Published: Hunt Allcott & Matthew Gentzkow & Chuan Yu, 2019. "Trends in the diffusion of misinformation on social media," Research & Politics, vol 6(2).