In this paper, the sufficient condition for the E-optimality of PBB designs with two associate classes is given.
This condition is expressed in terms of the parameters of design and their incidence matrix. In particular, the £-optimality criterion for equireplicated designs with binary incidence matrix is given. In this case, we can express the £-optimality criterion in terms of parameters of design only. Finally, we characterized the contrasts of treatment which determine the F-optimality of design.
