The online review service Yelp helps millions of consumers find the goods and services they seek. To help consumers make more-informed choices, Yelp includes over 120 million reviews. The file yelp contains a sample of 21 reviews for an Italian restaurant. Preprocess the text and generate frequency and binary document-

term matrices.

a. Which five terms appear in the most reviews? In how many reviews does each term appear?

b. Using Jaccard’s distance to compute dissimilarity between observations, apply hierarchical clustering employing Ward’s linkage to yield two clusters from the binary document-term matrix from the reviews. How many documents are in each cluster? Give a description of each cluster.