R: Breslow Data

breslow.dat {robust} | R Documentation

## Breslow Data

### Description

Patients suffering from simple or complex partial seizures were randomized to receive either the antiepileptic drug progabide or a placebo. At each of four successive postrandomization clinic visits, the number of seizures occuring over the previous two weeks was reported.

### Usage

    data(breslow.dat)

### Format

A data frame with 59 observations on the following 12 variables.

`ID`

  an integer value specifying the patient identification number.

`Y1`

  an integer value, the number of seizures during the first two week period.

`Y2`

  an integer value, the number of seizures during the second two week period.

`Y3`

  an integer value, the number of seizures during the third two week period.

`Y4`

  an integer value, the number of seizures during the fourth two week period.

`Base`

  an integer value giving the eight-week baseline seizure count.

`Age`

  an integer value giving the age of the parient in years.

`Trt`

  the treatment: a factor with levels `placebo` and `progabide`.

`Ysum`

  an integer value, the sum of `Y1`, `Y2`, `Y3` and `Y4`.

`sumY`

  an integer value, the sum of `Y1`, `Y2`, `Y3` and `Y4`.

`Age10`

  a numeric value, `Age` divided by 10.

`Base4`

  a numeric value, `Base` divided by 4.

### References

Breslow, N. E., and Clayton, D. G. (1993), "Approximate Inference in Generalized Linear Mixed Models," Journal of the American Statistical Association, Vol. 88, No. 421, pp. 9-25.

Thrall, P. F., and Vail, S. C. (1990), "Some Covariance Models for Longitudinal Count Data With Overdispersion," Biometrics, Vol. 46, pp. 657-671.

### Examples

    data(breslow.dat)

[Package robust version 0.6-1 Index]