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Industrial Statistics with Minitab by Xavier Tort-Martorell Llabres, Lluis Marco Almagro, Pere Grima Cintas

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17.3 Multi-Vari Chart with Four Sources of Variation

Continue using data from file MUFFIN.MTW. Break down column ‘Position’ into two different columns: ‘HorizontalPos’ (for horizontal position, left or right) and ‘VerticalPos’ (for vertical position, top or bottom). For instance, create column ‘HorizontalPos’ in the following manner.

Calc > Make Patterned Data > Text Values

nc17uf007.eps

To create column ‘VerticalPos’, the procedure is the same, but now the text values are Top and Bottom, the number of times to list each value: 1, and the number of times to list the sequence: 30.

With both new columns created, do:

nc17uf008.eps

The result is the following:

nc17uf009.eps

Take into account that the last factor in the multi-vari chart dialog box is the one used to divide the graph in the top and bottom parts. The third factor is the one placed in the horizontal axis; thus the best option is setting this factor as the one showing the temporal sequence

In general, multi-vari charts are better interpreted if the factor that shows the temporal evolution is in the third place.

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