**Sankhya: The Indian Journal of Statistics**

1995, Volume 57, Series B, Pt. 1, pp. 166--168

**A NOTE ON NON-ORTHOGONAL MAIN-EFFECT PLANS**

By

M. K. SHARMA, *N. D. U. A. & Technology*

SUMMARY. A method of constructing non-orthogonal main-effect plans of the type $2_\nu/(v+1)$ through partially balanced incomplete block designs by adding rows of -1's or +1's or both in the incidence matrices of the designs, is described. The procedure yields some saturated new non-orthogonal plans having higher efficiency (say 90% or above).

*AMS (1980) subject classification.* 62K15.

*Key words and phrases*. Partially balanced incomplete block design, regular group divisible design, triangular design, latin square design, non-orthogonal main-effect plans.