R: Epileptic seizures

seizures {DPpackage} | R Documentation

## Epileptic seizures

### Description

This data set consider information from a clinical trial of 59 epileptics, reported by Thall and Vail (1990). For each patient, the number of epileptic seizures was recorded during a baseline period of eight weeks. Patients were then randomized to treatment with the anti-epileptic drug progabide, or to aplacebo in addition to standard chemotherapy. The number of seizures was then recorded in four consecutive two-weeks intervals.

### Usage

    data(seizures)

### Format

A data frame with 295 observations on the following 5 variables.

`id`

  an ordered factor giving a unique identifier for the subject in the study.

`seize`

  a numeric vector giving the number of epileptic seizures.

`visit`

  a numeric vector giving the number of the visit, 0=baseline, and 1,2,3, and 4 for the four consecutive two-weeks intervals.

`trt`

  a numeric vector giving the treatment group.

`age`

  a numeric vector giving the age at the entry.

### Source

Thall, P.F., and Vail, S.C. (1990) Some covariance models for longitudinal count data with ovserdispersion, Biometrics, 46: 657-671.

### References

Diggle, P.J., Liang, K-Y., and Zeger, S.L. (1994) Analysis of longitudinal data. Oxford: Clarendon Press.

### Examples

    data(seizures)
    ## maybe str(seizures) ; plot(seizures) ...

[Package DPpackage version 1.1-7.4 Index]