matched


Researchers in a Midwestern county tracked flu cases requiring hospitalization in those residents aged 65
and older during a two-month period one winter. They matched each case with 2 controls by sex and age (150 cases,
300 controls). They used medical records to determine whether cases and controls had received a flu vaccine shot
and whether they had underlying lung disease. They wanted to know whether flu vaccination prevents hospitalization
for flu (severe cases of flu). Underlying lung disease is a potential confounder.


datasets

A mixed collection of useful and semi-useful diverse
statistical functions, some of which may even be referenced in
The R Primer book.

Claus Ekstrm

MESS

Miscellaneous Esoteric Statistical Scripts

matched function

A data frame with 450 observations on the following 4 variables.
  <dl>
    <dt><code>id</code></dt><dd>a numeric vector</dd> <dt><code>iscase</code></dt><dd>a factor with levels <code>Control</code> <code>Case</code></dd> <dt><code>vaccine</code></dt><dd>a factor with levels <code>Not</code> <code>Vaccinated</code></dd> <dt><code>lung</code></dt><dd>a factor with levels <code>None</code> <code>Disease</code></dd> </dl>

Format

Modified from: Stokes, Davis, Koch (2000). "Categorical Data Analysis Using the SAS System," Chapter 10.

matched: Flu hospitalization

Description

Arguments

Format

Source

Examples