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.
A data frame with 30 observations on the following 4 variables.
first measure of stiffness is obtained by sending a shock wave down the board
second measure is obtained by vibrating the board
third measure is obtained by a static test
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.
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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