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Individual Moving Range


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  • Seeq Team

Hello Kemi,

Thank you for your question. This chart can be created as follows;

1. Calculate the moving range in the formula tool;


2. Create the monthly condition using Identify > Periodic Condition tool and select a monthly duration.

3. Use Quantify > Signal from Condition tool to find the average moving range over each month. This is “CL” as shown in the video.


4. In the formula tool, calculate the UCL parameter as follows


Alternatively, create a new Signal from Condition to calculate the standard deviation of the moving average, and in formula use the following;


5. Add the signals to one lane and align their y-axis.


We also have a very comprehensive blog post on creating a Control Chart and applying SPC run rules which may be of interest to you.


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