fat {UsingR} | R Documentation

## Body measurements to predict percentage of body fat in males

### Description

A data set containing many physical measurements of 252 males. Most of the variables can be measured with a scale or tape measure. Can they be used to predict the percentage of body fat? If so, this offers an easy alternative to an underwater weighing technique.

### Usage

    data(fat)

### Format

A data frame with 252 observations on the following 19 variables.

case
  Case Number
body.fat
  Percent body fat using Brozek's equation, 457/Density - 414.2
body.fat.siri
  Percent body fat using Siri's equation, 495/Density - 450
density
  Density (gm/cm^2)
age
  Age (yrs)
weight
  Weight (lbs)
height
  Height (inches)
BMI
  Adiposity index = Weight/Height^2 (kg/m^2)
ffweight
  Fat Free Weight = (1 - fraction of body fat) * Weight, using Brozek's formula (lbs)
neck
  Neck circumference (cm)
chest
  Chest circumference (cm)
abdomen
  Abdomen circumference (cm) "at the umbilicus and level with the iliac crest"
hip
  Hip circumference (cm)
thigh
  Thigh circumference (cm)
knee
  Knee circumference (cm)
ankle
  Ankle circumference (cm)
bicep
  Extended biceps circumference (cm)
forearm
  Forearm circumference (cm)
wrist
  Wrist circumference (cm) "distal to the styloid processes"

### Details

From the source:

“The data are as received from Dr. Fisher. Note, however, that there are a few errors. The body densities for cases 48, 76, and 96, for instance, each seem to have one digit in error as can be seen from the two body fat percentage values. Also note the presence of a man (case 42) over 200 pounds in weight who is less than 3 feet tall (the height should presumably be 69.5 inches, not 29.5 inches)! The percent body fat estimates are truncated to zero when negative (case 182).”

### Source

This data set comes from the collection of the Journal of Statistics Education at http://www.amstat.org/publications/jse/datasets/fat.txt. The data set was contributed by Roger W. Johnson.

### References

The source of the data is attributed to Dr. A. Garth Fisher, Human Performance Research Center, Brigham Young University, Provo, Utah 84602,

### Examples

    data(fat)
    f = body.fat ~ age + weight + height + BMI + neck + chest + abdomen +
    hip + thigh + knee + ankle + bicep + forearm + wrist
    res = lm(f, data=fat)
    summary(res)

[Package UsingR version 0.1-4 Index]