m Chart in Excel

Jay Arthur
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The purpose of a m chart is to evaluate process stability when when you have summarized median and standard deviation data..

The m chart is used when the sample size varies: e.g., the total number of cases in a hospital varies from one period to the next.

Here is a sample of a m chart created using the QI Macros SPC Software for Excel.The stair step or skyline control limits are the result of the varying sample sizes.

m chart data looks like this:

m Charts are just one of the tools included in the QI Macros for Excel SPC Software for Excel.

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