I recently performed a custom design with 7x continuous and 1x 2-level categorical factors. Everything went well, and we moved forward with the suggested output.
We're revisiting this work and now need to expand by adding 2 additional catageorical factors into the design and i'm struggling to think of the best way to do it to make the most of the existing data. Fold overs or space filling designs don't seem to let me add additional factors into the grid.
To make it slighlty more complicated, we've also discounted one of the original catagoricals, so are only interested in the one of the original and the two new ones. Everything else can 'exist' in the original design space.
Does anyone have any suggestions?
I'll give that a try and let you know how it works.
In the end I did a mixture of what you suggested and a normal augmentation.
Adding the extra column allowed me to examine an additional continuous factor, and then when expanding the categoricals, I was able to add another level as part of the augmentation itself using the drop-down arrow in the factor dialouge box.
This allowed me to replace the existing factor we had discounted (by simply overwriting) whilst adding the required additional level to the categorical.
I ended up adding additional runs to get the suitable coverage, but even with that increase it was still much better than any solution i'd managed to date (and still used less overall runs). So all in all a great solution.
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