The Board Stiffness Dataset

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)

Results

R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> library(ACSWR)
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/ACSWR/stiff.Rd_%03d_medium.png", width=480, height=480)
> ### Name: stiff
> ### Title: The Board Stiffness Dataset
> ### Aliases: stiff
> ### Keywords: multivariate summaries
> 
> ### ** Examples
> 
> data(stiff)
> colMeans(stiff)
      x1       x2       x3       x4 
1906.100 1749.533 1509.133 1724.967 
> var(stiff)
          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
> pairs(stiff)
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>