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01 Nonrepresentativeness in Population Health Research: Evidence from a COVID-19 Antibody Study Deniz Dutz et.al Abstract： We analyze representativeness in a COVID-19 serological study with randomized participation incentives. We find large participation gaps by race and income when incentives are lower. High incentives increase participation rates for all groups but increase them more among under-represented groups. High incentives restore representativeness on race and income and also on health variables likely to be correlated with seropositivity, such as the uninsured rate, hospitalization rates, and an aggregate COVID-19 risk index. 02 Zooming to Class? Experimental Evidence on College Students' Online Learning during COVID-19 Michael S. Kofoed et.al Abstract： One persistent question in higher education is the efficacy of online education. In the fall of 2020, we randomized 551 West Point students in a required introductory economics course across 12 instructors to either an o
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