August 2009
Intermediate to advanced
648 pages
17h 35m
English
book
Categorical Data Analysis Using The SAS® System, 2nd Edition
by Maura E. Stokes, Charles S. Davis, Gary G. Koch
Content preview from Categorical Data Analysis Using The SAS® System, 2nd Edition
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10.6. Paired Observations in a Retrospective Matched Study
Epidemiological investigations often involve the use of retrospective, or case-control studies, where a person known to have the event of interest (case) is paired, or matched, with a person who doesn’t have the event (control). The idea is to determine whether the exposure factor is associated with the event; this is presumably made less complicated by using matching to control for possible covariates.
In a 1:1 matched study, the matched set consists of one case and one control from each stratum. This is the most common situation.
In a 1:m matched study, the matched set consists of one case and m controls. Usually, m ranges between 2 and 5.
In the m:n matched study, the matched set consists ...
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