摘要
This paper gives a main effect plus two plan (MEP.2 plan) for 2m factorials (m≥4) in the same setup as in Mukerjee and Chatterjee (Utilitas Math. 45 (1994) 213) in a smaller number of treatments. For a certain design T1, combinatorial properties on a design T2 are presented so that the design T=T1+T2 is a MEP.2 plan, where “+” stands for a union of two designs. Our results are more flexible for the choice of T2 than the results of Mukerjee and Chatterjee (Utilitas Math. 45 (1994) 213).