ABOUT CODIFICATION, CENTER POINTS AND AXIAL POINTS IN A SECOND-ORDER RESPONSE SURFACE DESIGN.

Regina Célia de Carvalho Pinto MORAN[1]

Adriana Barbosa SANTOS [2]

§    ABSTRACT: In this work a second-order composite design with three variables is considered. The pur5pose is to show some aspects associate to variables codification, center points and axial points in this kind of design. Computations of the increases that occur in the variance of the variable response estimator are presented, based on Box & Behnken (1960) formulation and considering others designs situations.

§    KEYWORDS: Variables codification; second-order composite design; axial points.

 



[1] Instituto de Estatística – UNICAMP – 13081-970 – Campinas – SP.

[2] Departamento de Ciências da Computação e Estatística - Instituto de Biociências, Letras e Ciências Exatas - UNESP - 15054-000 - São José do Rio Preto – SP.