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Chapter 15Design & Analysis of Experiments 8E 2012 Montgomery 1.

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7 Chapter 15Design & Analysis of Experiments 8E 2012 Montgomery 7 A GLM can be related to a standard regression model:

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22 Chapter 15Design & Analysis of Experiments 8E 2012 Montgomery 22 Approximate Methods Estimating missing values Setting dada aside

23 Chapter 15Design & Analysis of Experiments 8E 2012 Montgomery 23 15.3 The Analysis of Covariance A useful technique for dealing with uncontrollable but observable nuisance factors

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25 Chapter 15Design & Analysis of Experiments 8E 2012 Montgomery 25 The Basic ANCOVA Model The model is a combination of an ANOVA and a regression model The analysis is an “adjusted” ANOVA The procedure actually fits the covariate first, then fids the contribution of the treatment factor over and above the covariate Details of computing are in the text JMP, Minitab, and SAS can do the analysis

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44 Design of Experiments with Known Covariates In many situations the covariates are observed along with the response variable(s), so there is no opportunity to use information about the covariates to design the experiment Sometimes the covariates are known in advance, and when this is the case, this information can be used in constructing a design Chapter 15Design & Analysis of Experiments 8E 2012 Montgomery 44

45 Motor Oil Additive Experiment Properties of the product depend on two controllable factors They also depend on the viscosity and molecular weight of a raw material used to manufacture the product The raw material properties are known in advance, because there are 40 samples of this material available for use in the experiment Chapter 15Design & Analysis of Experiments 8E 2012 Montgomery 45

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