L11handout - PUBH 7430 Lecture 11 J. Wolfson Division of...

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Unformatted text preview: PUBH 7430 Lecture 11 J. Wolfson Division of Biostatistics University of Minnesota School of Public Health October 11, 2011 Model diagnostics Plot of residuals vs. fitted values • Plot Y- ˆ μ vs. ˆ μ , i.e. outcomes versus (estimated) mean • Used to verify “reasonableness” of: • Mean function: Look for trends in residuals with ˆ μ (lowess can be helpful) • Variance function assumption: Compare variability in spread of residuals for different values of ˆ μ to hypothetical variance function TotalTime: Gaussian GLM diagnostics ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● 0.3 0.4 0.5 0.6 0.7 0.8-1.5-1.0-0.5 0.0 0.5 1.0 1.5 Residuals vs. fitted values: Gaussian GLM Fitted values Residuals TotalTime: Gamma GLM diagnostics ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● 0.4 0.5 0.6 0.7 0.8 0.9-1.5-1.0-0.5 0.0 0.5 1.0 1.5 Residuals vs. fitted values: Gamma GLM Fitted values Residuals FastTrials: Poisson GLM diagnostics ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●...
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This note was uploaded on 11/21/2011 for the course PUBH 7430 taught by Professor Prof.eberly during the Fall '04 term at Minnesota.

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L11handout - PUBH 7430 Lecture 11 J. Wolfson Division of...

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