文摘
Orthogonal block designs for Scheff¨¦¡¯s quadratic model have been considered previously by , , and . obtained mixture component-amount designs via projections of standard mixture designs, viz., the simplex-lattice, the simplex-centroid and the orthogonally blocked mixture designs based on latin squares. considered the case of components assuming equal volume fractions and obtained mixture designs in orthogonal blocks using F-squares. In this paper, we construct orthogonal blocks of two and three mixture component-amount blends by projecting the class of four component mixture designs presented by .