O'Reilly logo

Categorical Data Analysis Using The SAS® System, 2nd Edition by Gary G. Koch, Charles S. Davis, Maura E. Stokes

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

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 ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required