| GVcontrol {IAcsSPCR} | R Documentation |
Control Chart for the generalized variance |S|
Description
This function makes a control chart of the generalized variance, |S|.
Usage
GVcontrol(DF,m,n,p)
Arguments
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 |
Value
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.
Author(s)
John Lawson
References
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.
Examples
library(IAcsSPCR)
data(Ryan92)
GVcontrol(Ryan92,20,4,2)
{
}