R: VA lung cancer data set

Lung {grpreg} | R Documentation

## VA lung cancer data set

### Description

Data from a randomised trial of two treatment regimens for lung cancer. This is a standard survival analysis data set from the classic textbook by Kalbfleisch and Prentice.

### Usage

    data(Lung)

### Format

The `Lung` object is a list containing three elements:

- `y`:A two column matrix (`Surv` object) containing the follow-up time (in days) and an indicator variable for whether the patient died while on the study or not.

- `X`:Matrix of predictors

- `group`:Vector describing how the columns of X are grouped

The matrix `X` contains the following columns:

- `trt`:Treatment indicator (1=control group, 2=treatment group)

- `karno1`, `karno2`, `karno3`:Orthogonal polynomials of first, second, and third degree representing Karnofsky performance score (0=bad, 100=good)

- `diagtime1`, `diagtime2`:Orthogonal polynomials of first and second degree representing time from diagnosis to randomization (months)

- `age1`, `age2`, `age3`:Orthogonal polynomials of first, second, and third degree representing the patient's age in years

- `prior`:Prior therapy (0=no, 1=yes)

- `squamous`, `small`, `adeno`, `large`:Indicators for the lung cancer cell type. For each subject, exactly one of these columns will be 1 and the rest 0.

### Source

http://CRAN.R-project.org/package=survival

### References

- Kalbfleisch D and Prentice RL (1980), The Statistical Analysis of Failure Time Data. Wiley, New York.

### See Also

`veteran`, `grpsurv`

### Examples

    data(Lung)
    hist(Lung$y[,1], xlab="Follow-up time", main="")
    table(Lung$y[,2])

[Package grpreg version 3.0-2 Index]