coneproj (version 1.2)

feet: 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)

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", c("Girl", "Boy"), pch = c(24, 21), col = c(2, 4))
    title("Kidsfeet Width vs Length Scatterplot")