How Minitab adds a signal factor to an existing design

When you add a signal factor to an existing static design, Minitab adds a new signal factor column after the factor columns and appends new rows (replicates) to the end of the existing worksheet. For example, if you add a signal factor with 2 levels to an existing L4 (23) array, 4 rows (1 replicate of 4 runs) are added to the worksheet. If you add a signal factor with 3 levels, 8 rows (2 replicates of 4 runs) are added to the worksheet. A replicate is the entire set of runs from the static design.

A B
1 1
1 2
2 1
2 2
Static design
A B Signal factor
1 1 1
1 2 1
2 1 1
2 2 1
1 1 2
1 2 2
2 1 2
2 2 2
Dynamic design, 2-level signal
A B Signal factor
1 1 1
1 2 1
2 1 1
2 2 1
1 1 2
1 2 2
2 1 2
2 2 2
1 1 3
1 2 3
2 1 3
2 2 3
Dynamic design, 3-level signal
Note

When you add a signal factor to an existing static design, the run order will be different from the order that results from adding a signal factor while creating a new design. The order of the rows does not affect the Taguchi analysis.

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