Hi all,
I ran a initial DSD and now trying to follow up with Custom Design with some interaction term mimicking RSM.
I set the range of lower and upper limit of each factor unless "fixed factors" as you can see below and added some interaction terms.
Then I made the design without having center points/ replicates with I-optimality, which created 15 treatments by default.
Most of the values generated on each factor levels are expected. However, I see two levels that is neither upper/lower limit nor center value on third factor (F3). You can see non-integer value (16.05 and 14.05) below.
Does anybody know why I get these numbers ? What is the theoretical reason behind it and Is there anyway to force it to become integer value that is either on upper/lower end or center point?
