gravel {dfphase1}

Gravel data

Description

This data set contains 56 individual bivariate observations from a gravel-producing plant given by Holmes and Mergen (1993). There are two variables measuring the percentage of the particles (by weight) that are large or medium in size, respectively.

Usage

data(gravel)

Format

A 2x56 matrix.

References

D. S. Holmes, A. Mergen (1993) “Improving the Performance of the T^2 Control Chart”, Quality Engineering, 5, pp. 619–625, doi:10.1080/08982119308919004.

Examples

data(gravel)
mphase1Plot(gravel)