Hotelling T2 Chart in Excel
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Hotelling T2 Chart in Excel |
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Jay Arthur
Copyright © 2011
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The Hotelling T2 chart helps evaluate two interacting measurements simultaneously. Similar to the XmR chart, 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
Other control charts in Excel 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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