Machine Learning with R by Brett Lantz is a book that provides an introduction to machine learning using R. As far as I can tell, Packt Publishing does not make its datasets available online unless you buy the book and create a user account which can be a problem if you are checking the book out from the library or borrowing the book from a friend. All of these datasets are in the public domain but simply needed some cleaning up and recoding to match the format in the book.
No datasets used
usedcars.csv could not be found online
wisc_bc_data.csv from https://archive.ics.uci.edu/ml/machine-learning-databases/breast-cancer-wisconsin/
sms_spam.csv from http://www.dt.fee.unicamp.br/~tiago/smsspamcollection/
credit.csv from https://archive.ics.uci.edu/ml/machine-learning-databases/statlog/german/
mushrooms.csv from https://archive.ics.uci.edu/ml/machine-learning-databases/mushroom/
challenger.csv from https://archive.ics.uci.edu/ml/machine-learning-databases/space-shuttle/
insurance.csv could not be found online
whitewines.csv from https://archive.ics.uci.edu/ml/machine-learning-databases/wine-quality/
concrete.csv from https://archive.ics.uci.edu/ml/machine-learning-databases/concrete/compressive/
letterdata.csv from https://archive.ics.uci.edu/ml/machine-learning-databases/letter-recognition/
groceries.csv is from arules package but probably just easier to call library(arules); data(Groceries)
snsdata.csv could not be found online
sms_results.csv is likely from the sms_test_pred object in Chapter 4 but difficult to be sure.
credit.csv is likely the same file from Chapter 5.
credit.csv from Chapter 5 is reused.
No datasets used