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.