These are the formulas used to determine the central line and control limits for the Moving Average Control charts.
Data Available
K = Number of samples
= the Mean of Subgroup i
|
Subgroup Size |
The Sigma is Estimated |
|
>1 |
Based on the average of the subgroup ranges. |
|
=1 |
Using the average of the moving range. |
Central Line
= 
Control limits
Where
= 
= | - 
|
|
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Moving average charts overview. |
