This paper discusses two types of split-plot designs, split-plot designs with few whole-plot factors and blocked split-plot designs. We provide a list of efficient designs and compare them with the designs available in the literature with respect to a surrogate for the information capacity criterion derived in Cheng and Tsai (2011). In many cases, either better designs are found or additional designs are identified as possible alternatives. In the remaining cases, the optimality of the designs tabulated in design literature is confirmed.
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