ogy:Jan 1997 29 1 AbUINFORM Global Optimal Response Surface Designs in the Presence of Dispersion Effects DARCY P.MAYS Virginia Commonwealth University,Richmond,VA 23284-2014 STEPHEN M.EASTER Randolph-Macon College,Ashland.VA 23005-5505 Standard response surface des e ial d optimal fofirst-or or in ction model,and balanced thre evel factorial des d-ord ever,in many situations the andlevelofdispersiog esign when d with a first-order or in recommendations are made as to what types of designs are preferred in different heterogeneous variance Introduction T tion to a detailed list of references to recent work thecopinloperatiangconditions.Ttisetrendofat aed Taguchi.who incorporated the scientists. berg (and MeCullagh and Pregibon (17)in into a testing problem sion effects,and the use of t eAitkin (1987)and Davidian and Carroll ( r (1986)con rd the ctor desg which are applicabe to many man- ufacturing and scientific processes.However,with Vol.29.No.1.January 1997 Journai of Quality Technology Reproduced with permission of the copyright owner.Further reproduction prohibited without permission.Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. Optimal response surface designs in the presence of dispersion effects Mays, Darcy P; Easter, Stephen M Journal of Quality Technology; Jan 1997; 29, 1; ABI/INFORM Global pg. 59