TH.data (version 1.1-2)

bodyfat: Prediction of Body Fat by Skinfold Thickness, Circumferences, and Bone Breadths

Description

For 71 healthy female subjects, body fat measurements and several anthropometric measurements are available for predictive modelling of body fat.

Usage

data("bodyfat")

Format

A data frame with 71 observations on the following 10 variables.

age

age in years.

DEXfat

body fat measured by DXA, response variable.

waistcirc

waist circumference.

hipcirc

hip circumference.

elbowbreadth

breadth of the elbow.

kneebreadth

breadth of the knee.

anthro3a

sum of logarithm of three anthropometric measurements.

anthro3b

sum of logarithm of three anthropometric measurements.

anthro3c

sum of logarithm of three anthropometric measurements.

anthro4

sum of logarithm of three anthropometric measurements.

Details

Garcia et al. (2005) report on the development of predictive regression equations for body fat content by means of common anthropometric measurements which were obtained for 71 healthy German women. In addition, the women's body composition was measured by Dual Energy X-Ray Absorptiometry (DXA). This reference method is very accurate in measuring body fat but finds little applicability in practical environments, mainly because of high costs and the methodological efforts needed. Therefore, a simple regression equation for predicting DXA measurements of body fat is of special interest for the practitioner. Backward-elimination was applied to select important variables from the available anthropometrical measurements, and Garcia (2005) report a final linear model utilizing hip circumference, knee breadth and a compound covariate which is defined as the sum of log chin skinfold, log triceps skinfold and log subscapular skinfold.

Examples

    data("bodyfat", package = "TH.data")

    ### final model proposed by Garcia et al. (2005)
    fmod <- lm(DEXfat ~ hipcirc + anthro3a + kneebreadth, data = bodyfat)
    coef(fmod)