lab11 - STAT5044 Lab11 Inyoung Kim Outline 1 How to fit GLM...

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Unformatted text preview: STAT5044: Lab11 Inyoung Kim Outline 1 How to fit GLM using R Example for logistic regression The logistic model we start with the relates the probability of developing Kyphosis to the three predictor variables, Age , Number , and Start . We fit the model using glm Call data Read data > #1. call data kyphosis<-read.table("/Users/inyoungkim/inyoung/Teaching/Stat5044/Fall2009/lab/kyphosis.txt",header=T) > summary(kyphosis) obs Kyphosis Age Number Start Min. : 1.00 absent :64 Min. : 1.00 Min. : 2.000 Min. : 1.00 1st Qu.:22.00 present:17 1st Qu.: 26.00 1st Qu.: 3.000 1st Qu.: 9.00 Median :43.00 Median : 87.00 Median : 4.000 Median :13.00 Mean :42.51 Mean : 83.65 Mean : 4.049 Mean :11.49 3rd Qu.:63.00 3rd Qu.:130.00 3rd Qu.: 5.000 3rd Qu.:16.00 Max. :83.00 Max. :206.00 Max. :10.000 Max. :18.00 Boxplot Box plot absent present 50 100 150 200 Kyphosis Age absent present 2 4 6 8 10 Kyphosis Number absent present 5 10 15 Kyphosis Start Logistic regression Summary statistic > kyph.glm.all<-glm(Kyphosis˜Age+Number+Start,family=binomial(),data=kyphosis) > summary(kyph.glm.all) Call: glm(formula = Kyphosis ˜ Age + Number + Start, family = binomial(), data = kyphosis) Deviance Residuals: Min 1Q Median 3Q Max-2.3124-0.5484-0.3632-0.1659 2.1613 Coefficients: Estimate Std. Error z value Pr(>|z|) (Intercept) -2.036934 1.449575-1.405 0.15996 Age 0.010930 0.0064460....
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lab11 - STAT5044 Lab11 Inyoung Kim Outline 1 How to fit GLM...

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