When the levels of some factors in an experiment are difficult to be changed or controlled, fractional factorial split-plot (FFSP) designs are commonly used in which the factors are classified as the whole plot (WP) and sub-plot (SP) factors. Mixed-level designs are used in practice when the levels of the factors are not equal to each other. This paper considers the mixed-level FFSP designs with the WP factors being more important than the SP factors. It proposes the combined minimum aberration criterion of type WP (WP-MA\(^{c}\)) for mixed-level FFSP designs. Some optimal mixed-level FFSP designs are constructed under the WP-MA\(^{c}\) criterion.

当实验中某些因子的水平难以改变或控制时，通常使用部分因子裂区 (FFSP) 设计，其中因子分为整区 (WP) 和子区 (SP) 因子. 当因子水平彼此不相等时，在实践中使用混合水平设计。本文考虑了 WP 因素比 SP 因素更重要的混合级 FFSP 设计。它为混合级 FFSP 设计提出了 WP 类型的组合最小像差标准 (WP-MA \(^{c}\) )。在 WP-MA \(^{c}\)准则下构建了一些最佳混合级 FFSP 设计。