Chapter 6. Domain-specific Applications

In this chapter, we will cover the following topics:

• Dealing with regular expressions

• Analyzing PDF reports in a folder with the tm package

• Creating wordclouds with the wordcloud package

• Performing a Twitter sentiment analysis

• Detecting fraud in e-commerce orders with Benford's law

• Measuring customer retention using cohort analysis in R

• Making a recommendation engine

• Performing time series decomposition using the stl() function

• Exploring time series forecasting with forecast()

• Tracking stock movements using the quantmode package

• Optimizing portfolio composition and maximizing returns with the Portfolio Analytics package

• Forecasting the stock market