PMC:7210464 / 91849-92260 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T885","span":{"begin":0,"end":54},"obj":"Sentence"},{"id":"T886","span":{"begin":55,"end":125},"obj":"Sentence"},{"id":"T887","span":{"begin":126,"end":243},"obj":"Sentence"},{"id":"T888","span":{"begin":244,"end":411},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The counterfactual change for date t is ΔYnt=Y~nt−Ynt. The standard error of ΔYnt is obtained from 1000 bootstrap iterations. In each bootstrap iteration, cities are sampled with replacement and the model is estimated to obtain the parameters. The counterfactual predictions are obtained using the above equations with the estimated parameters and the counterfactual scenario (e.g., no cities adopted lockdown)."}