stiff: The Board Stiffness Dataset

In ACSWR: A Companion Package for the Book "A Course in Statistics with R"

Description

Four measures of stiffness of 30 boards are available. The first measure of stiffness is obtained by sending a shock wave down the board, the second measure is obtained by vibrating the board, and remaining are obtained from static tests.

Usage

data(stiff)

Format

A data frame with 30 observations on the following 4 variables.

x1

first measure of stiffness is obtained by sending a shock wave down the board

x2

second measure is obtained by vibrating the board

x3

third measure is obtained by a static test

x4

fourth measure is obtained by a static test

References

Johnson, R.A., and Wichern, D.W. (1982-2007). Applied Multivariate Statistical Analysis, 6e. Pearson Education.

Examples

data(stiff)
colMeans(stiff)
var(stiff)
pairs(stiff)

Example output

      x1       x2       x3       x4 
1906.100 1749.533 1509.133 1724.967 
          x1        x2       x3        x4
x1 105616.30  94613.53 87289.71  94230.73
x2  94613.53 101510.12 76137.10  81064.36
x3  87289.71  76137.10 91917.09  90352.38
x4  94230.73  81064.36 90352.38 104227.96

ACSWR documentation built on May 2, 2019, 6:53 a.m.