R: Mandible Data

Mandible {lmtest} | R Documentation

## Mandible Data

### Description

Mandible Data.

### Usage

    data(Mandible)

### Format

Data from 167 fetuses, especially:

age

  gestational age in weeks.

length

  mandible length in mm.

### Source

The data was originally published by Chitty et al., 1993, and analyzed in Royston and Altman, 1994 (the data is given there). Only measurements with `age <= 28` were used in this analysis.

### References

L. S. Chitty and S. Campbell and D. G. Altman (1993), Measurement of the fetal mandible – feasibility and construction of a centile chart., Prenatal Diagnosis, 13, 749–756.

P. Royston and D. G. Altman (1994), Regression Using Fractional Polynomials of Continuous Covariates: Parsimonious Parametric Modelling. Applied Statistics, 43, 429–453.

### Examples

    data(Mandible)
    lm(length ~ age, data=Mandible, subset=(age <= 28))

[Package lmtest version 0.9-37 Index]