Overview of Variability Charts
Tip: The traditional name for a variability chart is a multi vari chart, but because that name is not well known, the more generic term variability chart is used instead.
Just as a control chart shows variation across time in a process, a variability chart shows the same type of variation across categories such as parts, operators, repetitions, and instruments. A variability chart plots the data and means for each level of grouping factors, with all plots side by side. Along with the data, you can view the mean, range, and standard deviation of the data in each category, seeing how they change across the categories. The report options are based on the assumption that the primary interest is how the mean and variance ...
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