Description Usage Format References Examples

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.

1 |

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

Johnson, R.A., and Wichern, D.W. (1982-2007). Applied Multivariate Statistical Analysis, 6e. Pearson Education. Tattar, et al. (2016). A Course in Statistics with R. J. Wiley.

1 2 |

```
x1 x2 x3 x4
Min. :1325 Min. :1170 Min. :1002 Min. :1176
1st Qu.:1715 1st Qu.:1596 1st Qu.:1296 1st Qu.:1520
Median :1863 Median :1680 Median :1466 Median :1674
Mean :1906 Mean :1750 Mean :1509 Mean :1725
3rd Qu.:2057 3rd Qu.:1889 3rd Qu.:1624 3rd Qu.:1881
Max. :2983 Max. :2794 Max. :2412 Max. :2581
```

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