Housekeeping and loading of necessary packages

First, clear out the workspace (after saving any R objects you will need later):

rm(list = ls())

Then, install the required packages:

install.packages("dplyr")install.packages("wakefield")install.packages("sqldf")install.packages("RSQLite")

The convention in this book will be to specify a simple install.packages("packagename") instruction to install the necessary packages, followed by a library("packagename") to load them into memory. Once the required packages are installed, you can either comment them out, or replace the line with conditional installation code:

try(require(dplyr) || install.packages("dplyr"))

But this syntax may not work on all R installations and GUIs, so we will keep ...

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