Description Usage Arguments Value Author(s) References Examples

This function makes a control chart of the generalized variance, |S|.

1 | ```
GVcontrol(DF,m,n,p)
``` |

`DF` |
input - this is dataframe containing the subgrouped multivariate data. One line for each observation and one column for each variable or quality characteristic being monitored. The first column is a subgroup indicator numbered from 1 to m, with n repeats of each. There should be m x n rows and p + 1 columns. |

`m` |
input this is the number of observations in each subgroup |

`n` |
input this is the known (or estimate from a Phase I study) mean vector of the variables |

`p` |
input this is the number of quality characteristics |

returned list containing the upper control limit, the covariance matrix (S), the generalized variance (|S|), the mean vector (mu), and a vector of the generalized variances (|Si|, i=1,2,...m) within each subgroup.

John Lawson

Alt, F. B. (1985) "Multivariate Quality Control", Encyclopedia of Statistical Sciences, Vol. 6 Editors N. L. Johnson and S. Kotz, John Wiley and Sons, N. Y.

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