Srivastava, J. N.; Ghosh, S. - In: Statistics & Probability Letters 26 (1996) 1, pp. 51-60
The condition of proportional frequencies for main-effect plans is stated in Addelman (1962, 1963). The condition of … orthogonality of the main-effect plans. The condition of equal frequencies implies the condition of proportional frequencies, but … not conversely. The paper examines the main-effect plans which satisfy only the condition of proportional frequencies. The …