Question

Install and load the dataset named Carseats (in the ISLR package) into R. Obtain the residual...

Install and load the dataset named Carseats (in the ISLR package) into R.
Obtain the residual plots vs the predicted values of the model.
Can you see a pattern in the plots ? do we need to transform the predicted values ?


Math   Statistics-And-Probability   
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Homework Answers

Answer #1

R-codes :

library(ISLR)
data("Carseats")

csData=Carseats
str(csData)

lmModel<-lm(Sales~.,data = csData)


plot(lmModel,1)

plot(lmModel,3)

Plot-1:

Plot-2:

Conclusion:

After studying above Plot-1 and Plot-2, we observe there is no pattern and Red line is almost horizontal.

Hence, no need to transform the predicted values.

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