ModelCheck - ij ij ij e y y =-Residuals Calculation: Cotton...

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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 = + +
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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: 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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This note was uploaded on 08/27/2011 for the course EIN 4905 taught by Professor Staff during the Spring '08 term at University of Florida.

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ModelCheck - ij ij ij e y y =-Residuals Calculation: Cotton...

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