Dey, Aloke; Mukerjee, Rahul - In: Statistics & Probability Letters 82 (2012) 12, pp. 2180-2188
With reference to a partially confounded design for a 3n factorial experiment, an explicit expression is derived for the efficiency factors of natural contrasts of the forms linear, linear × linear, linear × quadratic, etc. This expression involves the harmonic mean of the efficiency factors...