ZmR Control Chart in Excel

Use an ZmR Chart to Evaluate Stability of Short Run Processes

Here is an example of an ZmR Chart created using QI Macros for Excel.

You can use a ZmR Chart to:

  • Short Run SPC
  • Show multiple characteristics (e.g., hardness, finish, etc.) on one chart
  • Track a part as it goes through the manufacturing process

The ZmR Chart does this by converting the X values into a standardized value, Z, using the average (m) and standard deviation (s). There are a number of ways to estimate s. QI Macros uses standard deviation for each part.

Zi = (Xi- m)/s

So the UCL = 3, LCL = -3 and CL = 0:

ZmR Chart Excel using QI Macros

ZmR Chart data usually looks like this:

ZmR chart data example

The ZmR chart can help you evaluate a short run process.


Why Choose QI Macros Over Other Control Chart Software?

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