Q.1 Load the us.civil.war.battles dataset in the package cluster.datasets. Run an off-the-shelf k-means clustering algorithm with k = 4. How did the model do? Plot the PCA representation of the model using the plot function from useful and examine the fit. Estimate and plot a Hartigan model and comment on the results.

Q.2 Estimate a random forest model using caret, over the Griliches wage data in the package Ecdat. Run the command modelLookup("rf") to determine how to design the tuneGrid parameter.