Consider the following hypothetical pooled cross-sectional data of dailyCOVID-19 cases per 1,000 people during the early two months of the pandemic, fromMarch to April 2020 in Ohio and 5 other neighboring states. The variable Apriltakesvalue 1 if the recorded cases are from April 2020, and takes value 0 if the recorded casesare from March 2020. The variable lockdown takes value 1 if the state put in place aStay-at-home order beginning from March 2020, and takes value 0 otherwise. Using thedifference-in-differences estimator, assess the impact of the lockdown policy on dailyCOVID-19 cases.

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