IAcsSPCR (version 1.2.1)

GVcontrol: 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.

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

# NOT RUN {
library(IAcsSPCR)
data(Ryan92)
GVcontrol(Ryan92,20,4,2)
{
  }
# }