ryan {dfphase1}

Ryan data

Description

This data set contains the data given in Table 9.2 by Ryan (2011, p. 323). The sample comprises 20 subgroups, each with 4 observations, on two quality characteristics X_1 and X_2. According to Ryan (2011), the 10th and 20th subgroups are out-of-control.

Usage

data(ryan)

Format

A 2x4x20 array.

References

T. P. Ryan (2011), Statistical Methods for Quality Improvement, 3rd ed., Wiley.

Examples

data(ryan)
mphase1Plot(ryan)