Clinical trial comparing two treatments for a respiratory illness

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Description

The data are from a clinical trial of patients with respiratory illness, where 111 patients from two different clinics were randomized to receive either placebo or an active treatment.

Usage

1

Format

A data frame with 555 observations on the following 7 variables.

id

a factor with 56 levels

gender

a factor with levels F and M

center

a factor with levels C1 and C2

treatment

a factor with levels placebo and active

age

a numeric vector

visit

a numeric vector

status

a factor with levels poor and good (response)

Details

Patients were examined at baseline and at four visits during treatment. At each examination, respiratory status (categorized as 1 = good, 0 = poor) was determined.

Warning

The original description says there are 111 patients, yet the data contain only 56 IDs.

Note

Original variable names have been adapted to R conventions. Data were reshaped from wide to long format and the response named status. The center ID was prefixed with the letter ā€œCā€ in the center variable, compared to the source.

Source

http://biosun1.harvard.edu/~fitzmaur/ala

References

Stokes ME, Davis CS, Koch GG (1995) Categorical Data Analysis using the SAS System. Cary, NC: SAS Institute, Inc.

Examples

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