We will input the Groceries data using the read.csv() function.
We can use the file.show() function to directly examine the input file if needed. This is sometimes needed if you find that there are errors in the input. It has been commented out in the code, but you are encouraged to try it out yourself.
The knitr library will be used mostly for the purposes of display formatted text output via the kable function. If you wish, you can replace kable function calls with head or print functions:
rm(list = ls())library(sqldf) library(knitr) setwd("C:/PracticalPredictiveAnalytics/Data")
Set stringsAsFactors to FALSE since we will be manipulating the variables as character strings later:
options(stringsAsFactors = ...