Hotelling T2 Chart in Excel

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Hotelling T2 Chart from QI Macros in Excel

The Hotelling T2 chart helps evaluate two interacting measurements simultaneously.

Similar to the XmR, the Hotelling T2 chart evaluates the covariances of the ranges between each of the two measures and the covariances of the actual data points. This gives two charts that are similar to the average and Range in the XmR.

Imagine for a moment that you are measuring the location of a hole drilled in a sheet of metal. It could be left or right, up or down. It's possible that both measurements, taken separately, could be stable and predictable, but the two together could have outliers.

T21 Chart

T22 Chart

The Hotelling T2 Chart is just one of the tools included in the QI Macros for Excel SPC Software for Excel.

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