When you are working with subgrouped data, it can be helpful to accompany a cusum chart for means with a Shewhart s chart for monitoring the variability of the process. This example creates this ...

A cusum chart is more efficient for detecting small shifts in the process mean, in particular, shifts of 0.5 to 2 standard deviations from the target mean (refer to Montgomery 1996). Lucas (1976) ...

The CuSum plot shows an important change in slope at batch 315. Prior to this point, the slope is predominantly negative, while subsequently the slope is consistently positive. The change in slope of ...

Xbar, EWMA, CUSUM and discrete event methods for detecting process problems; Methods for analyzing process changes by looking at general process physics; How to apply these methods to achieve ...

Background: CUSUM analysis is an analytic tool for monitoring institutional quality and clinical outcomes. CUSUM is a summative plot of an event that occurs over time. The slope that is generated can ...