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

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10.7. 1:m Conditional Logistic Regression

Researchers in a midwestern county tracked flu cases requiring hospitalization in those residents aged 65 and older during a two-month period in one winter. They matched each case with two controls according to sex and age and also determined whether the cases and controls had a flu vaccine shot and whether they had lung disease. Vaccines were then verified by county health and individual medical practice records. Researchers were interested in whether vaccination had a protective influence on the odds of getting a severe case of flu.

This study is an example of a 1:2 matched study since two controls were chosen for each case. Thus, in order to analyze these data with the SAS System, you need to use ...

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