cumulative sum chart

cumulative sum chart

[′kyü·myə·ləd·iv ′səm ‚chärt]
(industrial engineering)
A statistical control chart on which the cumulative sum of deviations is plotted over a period of time and which often has a sliding V-shaped mask for comparing the plot with allowable limits. Also known as cusum chart.
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The procedure used by Taylor for performing a change-point analysis iteratively uses a combination of cumulative sum charts (CUSUM) and bootstrapping to detect the changes.
Binary cumulative sum charts, based on the theory of sequential probability ratio tests, monitor a cumulative term that is incremented or decremented by certain amounts for each positive or negative result, respectively, in order to sequentially test between user-specified acceptable and unacceptable rates (35,36) (Equation 1).
Figure 1 plots the three cumulative sum charts from Table 2, using a weighted moving average for smoothing, with period 11.

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