When a treatment may be given at various times, it is important to form matched pairs or sets in which subjects are similar prior to treatment but avoid matching on events that were subsequent to treatment. This is done using risk-set matching, in which a newly treated subject at time t is matched to one or more controls who are not yet treated at time t based on covariate information describing subjects prior to time t.
KeywordsPneumonia Income Cystitis Silber
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