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Information Services and Products |
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| A "control chart" is a picture of the process as it occurs. I think of it as foot prints in the snow. There are many styles and methods for control charting. |
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Here's how one basic type is built: |
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| Each time a measurement is made, a new mark is placed on the control chart. |
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| We add lines that connect the measurements so we can see patterns: |
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| Here's how a Normal Distribution is related to a Control Chart : |
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| See how if you "stack up" all the plot marks on the control chart, it makes a normal distribution shape? |
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- Trick 8, Use Ranges to Find the Control Limits
