Changeover Designs and Factorial Structure
定义了轮换设计中因子结构的概念，并证明它是这类设计的理想特性。研究发现所有广义循环轮换设计都具有因子结构，为因子实验提供了灵活的设计类别。
SUMMARY Existing changeover designs given in the literature are not necessarily suitable when the treatments come from a factorial experiment. The concept of factorial structure in changeover designs is defined and shown to be a desirable requirement for these types of designs. Different classes of designs are then examined in the light of this concept. In particular, it is shown that all generalized cyclic (GC/n) changeover designs have factorial structure, thereby providing a flexible class of useful designs.