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Category » Control Charts
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ST: What are X-MR charts
Revision Date: 2005-09-06 X and MR charts are individual moving range charts. For some processes, it does not make sense to sample more than once. For example, almost anything you measure in a liquid (such as viscosity) is relatively uniform throughout the liquid. Repeated measurements are ...- ST: When using a small population, is it acceptable to establish subgroups by averaging samples
Revision Date: 2005-09-06 We want to take the average or samples 1 and 2, 2 and 3, 3 and 4 etc., to develop an and range of the same samples to establish the calculations. Answer: You are describing a moving average and moving range chart. The average of two values smoothes the data comp ...