Exercises

Today, I read the book “Applied Predictive Modeling”. I am trying to accomplish all the exercises of Chapter 3. But there are still some problems. For example, I cannot install some packages which are shown in the book. So I cannot finish the following tasks.

Summary

Creating Dummy Variables

1.

Head(carSubset)

Levels(carSubset$Type)

Simplemod=dummyVars( Mileage+Type, data=carSubset, levelsOnly=TRUE)

Simplemod

Predict(simplemod, head(carSubset))

Exercises

1.

> library(mlbench)

> data(Glass)

> Glass

> library(e1071)

> type=grep("Type", names(Glass))

> Glassvalue=Glass[, -type]

> Glassvalue

> skewvalues=apply(Glassvalue, 2, skewness)

> skewvalues

        RI         Na         Mg         Al         Si          K         Ca 

 1.6027151  0.4478343 -1.1364523  0.8946104 -0.7202392  6.4600889  2.0184463 

        Ba         Fe 

 3.3686800  1.7298107

> correlations=cor(Glassvalue)

Tomorrow, I will try to figure the problems out.