Two Level Fractional Iterator
Parameters
relation
the set of words for the defining relation.
num Reps
the number of replications for the design points. Must be greater or equal to 1. If null, then the current value for the number of replications of each design point is used. Null is the default.
sign
the sign of the generator 1.0 = I, -1.0 = -I. The default is 1.0.