Hello Dear All,
I have several DoE problems that include categorical
factors that I need to screen. The number of factors with two levels varies
between 3 and 5 while the number of factors with three levels varies between 2
and 3. It seems to me that I can use for all the situations described above a fractional
factorial design obtained from a L18 Hunter design which includes 8 two level
factors and 4 three level factors. The fractional designs are obtained by selecting an appropriate subset of columns from the original design,
as stated in the JMP DoE guide. If I use the JMP screening design platform to
design these screening designs JMP automatically shows a L18 Hunter design. My
questions are:
- How does JMP obtain this design from the original L18 design? Which columns are
deleted? - For my situations, are there better known designs with fewer runs to screen my
factors? When I use the JMP custom design platform with a main effect model a
12 run design is sometimes suggested, so I wonder if there is a known 12 run
screening experiment (main effects only) for the situations described above or
for some of them.
Many thanks!
Marcello.
