This article studies two-level nonregular factorial split-plot designs.
The concepts of indicator function and aliasing are introduced
to study such designs. The minimum G-aberration criterion
proposed by Deng and Tang (1999) [4] for two-level nonregular factorial
designs is extended to the split-plot case. A method to construct
the whole-plot and sub-plot parts is proposed for nonregular
designs. Furthermore, the optimal split-plot schemes for 12-, 16-,
20- and 24-run two-level nonregular factorial designs are searched,
and many such schemes are tabulated for practical use