Data from 167 fetuses, especially:
gestational age in weeks.
mandible length in mm.
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.
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.
data(Mandible) lm(length ~ age, data=Mandible, subset=(age <= 28))
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