In many industrial applications, the output of a process characterized by p variables that are measured simultaneously. Independent variables can be charted individually, but if the variables are ...

Discover how quality control charts help track product standards, pinpoint issues, and ensure processes meet specifications with this essential tool for quality assurance.

In this situation, it was shown by Gnanadesikan and Kettenring (1972), using a result of Wilks (1962), that T 2 i is exactly distributed as a multiple of a variable with a beta distribution.

The Canadian Journal of Statistics / La Revue Canadienne de Statistique, Vol. 23, No. 1 (Mar., 1995), pp. 85-99 (15 pages) A new control chart, called the θ chart, for monitoring the mean of a process ...