Copy of Assignment 9.txt

Copy of Assignment 9.txt - #Problem 1#In this problem you...

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#Problem 1 #In this problem, you will use support vector approaches to predict whether a given car gets high #or low gas mileage based on the Auto data set in the ISLR package. #(a) Create a binary variable that takes on a 1 for cars with gas mileage above the median, and a 0 #for cars with gas mileage below the median. Use this variable as response in the following analysis. install.packages("dplyr") library(ISLR) library(e1071) library(dplyr) attach(Auto) Auto1 <- Auto var <- ifelse(Auto$mpg > median(Auto$mpg), 1, 0) Auto$mpglevel <- as.factor(var) plot(Auto) auto_data <- select(Auto, c(displacement, horsepower, weight, acceleration, mpglevel)) #(b) Fit a support vector classifier to the data with various values of cost, to predict whether a car #gets high or low gas mileage. Report the cross-validation errors associated with different values of #this parameter. Comment on your results. set.seed(1) ### divide into equal sets of testing and training data train <- sample(1:dim(auto_data)[1], dim(auto_data)[1] / 2) test <- -train train.auto = auto_data[train, ] test.auto = auto_data[test, ] # Run the SVM tune.out.linear <- tune(svm, mpglevel ~ ., data = train.auto, kernel = "linear", ranges = list(cost = c(0.001, 0.01, 0.1, 1, 5, 10, 100))) best.auto.linear <- tune.out.linear$best.model summary(best.auto.linear) y.prediction.linear <- predict(best.auto.linear, test.auto) linear <- table(predict = y.prediction.linear, truth =
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