The extent to which products meet specifications needs to be systematically monitored in a production process. Product quality will typically be defined by two quantities: deviations from stated ...

Control charts have two general uses in an improvement project. Undeniably, the most common application is as a tool to ...

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 ...

Montgomery (1996) points out that a moving range chart should be interpreted with care because "the moving ranges are correlated, and this correlation may often induce a pattern or runs or cycles on ...

Measure: Only those characteristics that can be counted or measured are candidates for control. It is important to consider how measurement will be accomplished. Correct: When a process is out of ...