EntityQ25053940· pop 6· linked from 14 articlessynthetic control methodSign in to savecausal inference methodConnectionsdifference in differencesEntityeconomicsEntityPhiladelphiaEntitypolitical scienceEntitydigital object identifierEntityInternational Standard Serial NumberEntitycriminologyEntityQ180686EntityJSTOROrganizationQ229883EntityDavid CardEntityQ22908627Entityweighted meanEntityHandle SystemEntityconfoundingEntityhealth policyEntityAlan B. KruegerEntityThe American Economic ReviewEntityMariel boatliftEntityinstrumental variables estimationEntityCategoriesDesign of experimentsEconometric modelingObservational studyStatistical methods