TY - JFULL AU - Rita SahaRay and Ganesh Dutta PY - 2016/12/ TI - On the Optimality of Blocked Main Effects Plans T2 - International Journal of Mathematical and Computational Sciences SP - 582 EP - 586 VL - 10 SN - 1307-6892 UR - https://publications.waset.org/pdf/10005831 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 119, 2016 N2 - In this article, experimental situations are considered where a main effects plan is to be used to study m two-level factors using n runs which are partitioned into b blocks, not necessarily of same size. Assuming the block sizes to be even for all blocks, for the case n ≡ 2 (mod 4), optimal designs are obtained with respect to type 1 and type 2 optimality criteria in the class of designs providing estimation of all main effects orthogonal to the block effects. In practice, such orthogonal estimation of main effects is often a desirable condition. In the wider class of all available m two level even sized blocked main effects plans, where the factors do not occur at high and low levels equally often in each block, E-optimal designs are also characterized. Simple construction methods based on Hadamard matrices and Kronecker product for these optimal designs are presented. ER -