FOLDOVERS OF 2(K-P) RESOLUTION-IV EXPERIMENTAL-DESIGNS

Two simple rules are used to develop foldovers for 2(k-p) fractional f actorial designs. Although the rules are general, our focus is on fold overs for resolution IV designs. Foldovers that sign-reverse more than one factor can generate alias sets that cannot be obtained from a sig n-reversal of a single factor. The potential alias structure can be li mited by widely-used statistical software. An example illustrates the interplay of the rules and information from active alias sets in the o riginal fractional experiment.