feet: Foot Measurements for Fourth Grade Children

In coneproj: Primal or Dual Cone Projections with Routines for Constrained Regression

Foot Measurements for Fourth Grade Children

Description

This data set was collected by the first author in a fourth grade classroom in Ann Arbor, MI, October 1997. We use the shapereg function to make a shape-restricted fit to this data set. "Width" is a continuous response variable, "length" is a continuous predictor variable, and "sex" is a categorical covariate. The constraint is that "width" is increasing with respect to "length".

Usage

data(feet)

Format

A data frame with 39 observations on the following 8 variables.

name

First name of child.

month

Birth month.

year

Birth year.

length

Length of longer foot (cm).

width

Width of longer foot (cm), measured at widest part of foot.

sex

Boy or girl.

foot

Foot measured (right or left).

hand

Right- or left-handedness.

Source

Meyer, M. C. (2006) Wider Shoes for Wider Feet? Journal of Statistics Education Volume 14, Number 1.

Examples

    data(feet)
    l <- feet$length
    w <- feet$width
    s <- feet$sex
    plot(l, w, type = "n", xlab = "Foot Length (cm)", ylab = "Foot Width (cm)")
    points(l[s == "G"], w[s == "G"], pch = 24, col = 2)
    points(l[s == "B"], w[s == "B"], pch = 21, col = 4)
    legend("topleft", bty = "n", c("Girl", "Boy"), pch = c(24, 21), col = c(2, 4))
    title("Kidsfeet Width vs Length Scatterplot")

coneproj documentation built on Nov. 5, 2025, 6:08 p.m.