Average Run Length Definition and Explanation PDF | Download eBooks
Learn Average Run Length definition in total quality management with explanation to study “What is Average Run Length”. Study average run length explanation with TQM terms to review total quality management course for online MBA programs.
Average Run Length Definition:
Average Run Length (ARL) is the average number of points that must be plotted before a point indicates an out-of-control condition.
Introduction to Statistical Quality Control by Douglas C. Montgomery
Average Run Length Explanation:
While developing control charts, some important considerations must be made. Two main values must be specified that are sample size and sample frequency. Sample size is the total number of observations in a sample while sample frequency shows how frequently the samples must be drawn. There must be a trade-off between sample size and sample frequency. A way to determine the sample size and frequency is average run length. Average run length of a process control chart shows the minimum data points that must be plotted until an out of control condition. Average run length can be calculated through 1/p where p is the probability that a data point will be out of control limits. For example, if the average run length is 310, it means that even an in-control process would give an out of control point every 310 samples.
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