Fitting response surface models is usually carried out using statistical packages to solve complicated equations in order to produce the estimates of the model coefficients. This paper proposes a new procedure for fitting response surface models to mixed two-level and four-level factorial designs. New and easier formulae are suggested to calculate the linear, quadratic and the interaction coeff...

An m × n row-column factorial design is an arrangement of the elements a into rectangular array. Such array used in experimental design, where rows and columns can act as blocking factors. Formally, for any integer q, let [ q ] = { 0 , 1 … − } . The k (full) with replication α multiset consisting occurrences each element ; we denote this by A regular (which say type I ( ) such that row (column)...