Sanjay Bhure Posted March 30 Report Share Posted March 30 Xbar S chart often used control chart to analyze the process mean and standarad deviation over time. This chart is used when the subgroup size is more than 10. The S chart provides a better understanding of the spread of data as compare to the range. X bar S Control Chart definitions X Bar: The mean varies in the process over time from subgroup values. The mean and standarda deviation is used to calculate the control limits. S Chart: This represents the standard deviation of the process over time from mean of subgroups value. This monitors the process standard deviation. Link to comment Share on other sites More sharing options...
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