rectangles {MPV}

Length Measurements on Rectangular Objects

Description

Observations of heights, widths and diagonal lengths of several rectangular objects, such as books, photographs, and so on were measured. Only the data in MPV versions 1.62 and later can be trusted; there were errors in the third column in previous versions.

Usage

rectangles

Format

A data frame with 51 observations on the following 4 variables.

h

numeric, heights in centimeters

w

numeric, widths in centimeters

d

numeric, diagonal lengths in centimeters

index

numeric, sum of squares of heights and widths

Examples

x <- sqrt(rectangles$index)
y <- rectangles$d
y.lp <- locpoly(x, y, bandwidth=dpill(x,y), degree=1)
plot(y ~ x)  
lines(y.lp, col=2, lty=2)
abline(0,1) # y = x + measurement error
plot(y.lp$y - y.lp$x, type="l", col=2)