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ModelCheck

# ModelCheck - ˆ ij ij ij e y y =-Residuals Calculation...

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Experiments with a Single Factor Model Adequacy Checking ModelCheck.ppt D.A. Schaub, Univ. of Florida

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ANOVA Assumptions We are assuming a model of  Therefore residuals (errors) need to be Normally distributed Independent Mean = zero Constant, but unknown variance  σ 2 ij i ij y μ τ ε = + +
Residuals Examination The ANOVA assumptions will not hold  exactly, but we do need to know about  gross violations before confirming  model validity At a minimum we need to calculate  residuals And then run set validations

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Unformatted text preview: ˆ ij ij ij e y y =-Residuals Calculation: Cotton Tensile Strength Example 9.8 ANOVA Validation Plots We need to create plots to validate our assumptions Normal Probability plot – will check for normally distributed residuals Residuals vs. Fitted Values – will check for constant variance Residuals vs. Run Order – will check for independence of the residuals Minitab will do all of these (See figure 3-4, p. 78)...
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ModelCheck - ˆ ij ij ij e y y =-Residuals Calculation...

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