R: Down syndrome in babies

down {segmented} | R Documentation

## Down syndrome in babies

### Description

The `down` data frame has 30 rows and 3 columns. Variable `cases` means the number of babies with Down syndrome out of total number of births `births` for mothers with mean age `age`.

### Usage

    data(down)

### Format

A data frame with 30 observations on the following 3 variables.

`age`

  the mothers' mean age.

`births`

  count of total births.

`cases`

  count of babies with Down syndrome.

### Source

Davison, A.C. and Hinkley, D. V. (1997) Bootstrap Methods and their Application. Cambridge University Press.

### References

Geyer, C. J. (1991) Constrained maximum likelihood exemplified by isotonic convex logistic regression. Journal of the American Statistical Association 86, 717–724.

### Examples

    data(down)

[Package segmented version 0.5-3.0 Index]