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

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 ...

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 ...