vcdExtra (version 0.8-5)

Burt: Burt (1950) Data on Hair, Eyes, Head and Stature

Description

Cyril Burt (1950) gave these data, on a sample of 100 people from Liverpool, to illustrate the application of a method of factor analysis (later called multiple correspondence analysis) applied to categorical data.

He presented these data initially in the form that has come to be called a "Burt table", giving the univariate and bivariate frequencies for an n-way frequency table.

Usage

data("Burt")

Format

A frequency data frame (representing a 3 x 3 x 2 x 2 frequency table) with 36 cells on the following 5 variables.

Hair

hair color, a factor with levels Fair Red Dark

Eyes

eye color, a factor with levels Light Mixed Dark

Head

head shape, a factor with levels Narrow Wide

Stature

height, a factor with levels Tall Short

Freq

a numeric vector

Details

Burt says: "In all, 217 individuals were examined, about two-thirds of them males. But, partly to simplify the calculations and partly because the later observations were rather more trustworthy, I shall here restrict my analysis to the data obtained from the last hundred males in the series."

Head and Stature reflect a binary coding where people are classified according to whether they are below or above the average for the population.

Examples

data(Burt)
mosaic(Freq ~ Hair + Eyes + Head + Stature, data=Burt, shade=TRUE)

#or
burt.tab <- xtabs(Freq ~ Hair + Eyes + Head + Stature, data=Burt)
mosaic(burt.tab, shade=TRUE)