Abstract: Lenth (1989) introduced a very simple method for identification of active contrasts in unreplicated factorial and fractional factorial experiments. This article gives another method which is as simple as Lenth's method. The method is compared with that of Lenth in both theoretical study and simulation experiments. Also, the method is illustrated with examples from Box and Meyer (1986) and compared with other existing methods.
Key words and phrases: Unreplicated fractional factorials, active contrasts.