Hi. I'm using JMP Pro 15.2.1.
I'm doing a split plot design where X1 is my very hard to change factor with 3 levels (whole plots) and X2 is a hard to change factor with 3 levels (subplots). Only two of the three levels of X2 can be done in each whole plot, so I designated 3 whole plots and 6 subplots to achieve that effect, where the hard to change factor can NOT change independently of the very hard to change factor.
![custom dialog.jpg custom dialog.jpg](https://community.jmp.com/t5/image/serverpage/image-id/54430iCF6483DE260410C3/image-size/large?v=v2&px=999)
After clicking 'make design':
![design result.jpg design result.jpg](https://community.jmp.com/t5/image/serverpage/image-id/54431iF20FC94C3D6D5CB1/image-size/large?v=v2&px=999)
The default 'Fit Model' dialog:
![fit model.jpg fit model.jpg](https://community.jmp.com/t5/image/serverpage/image-id/54432i1BA836769C7E6130/image-size/large?v=v2&px=999)
I'm confused why JMP includes the 'whole plot' and 'subplots' terms in the construct model effects window, in addition to the X1 and X2 terms that are those whole and subplot factors. Is that not redundant?