Zhang et al. (2020) used linear regression to quantify the effect of lockdowns on the number of cases of COVID-19. We show using differential questions from the SIR model and with a counterexample that was not included in Zhang et al.'s analysis that their method is flawed .
Zhang et al. (2020) used linear regression to quantify the effect of lockdowns on the number of cases of COVID-19. We show using differential equations from the SIR model and with an example from another location their analysis did not include that their analysis should not be considered sound evidence .
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a counterexample that was not included in Zhang et al.'s analysis that their method is flawed
an example from another location their analysis did not include that their analysis should not be considered sound evidence