
2/5/2009
TheOVATApproach
Changingthevalueof
OneseparateVariableAtX2
aTimeoftengivesmisleading
results.
Theexperimenterbelieves
thattheoptimumresulthas
beenreachedsimplybecause
furtherchangesinthelast
variablestudiedleadtono
furtherimprovement.X1
Thisapproachtakesnoaccountofpossibleinteractionsbetween
variables
Statisticalmethodstakeaccountofallvariablessimultaneously
BasicSimplexMethod
ForNvariables
chooseN+1initial
n
otrials
i
t
a
r–Chooseconditions
t
n
eaccordingtoexisting
c
nC(45%)experience
o
C
Runinitialtrialsand
compareresults
AB(35%)Rejectworsttrial(A)
(30%)
Temperature
W.Spendley,G.R.HextF.R.Himsworth;
Technometrics,1962,4,441
2
2/5/2009
BasicSimplexMethod
80%
Computenewpoint
(D)byreflecting
G(58%)
H(66%)rejectedpoint(A)
n
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