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 YelpItalian contains a sample of 21 reviews for an Italian restaurant. Normalize the terms by using stemming and a generate binary term-document matrix.
a. What are the five most common terms in these reviews? How often does each term appear?
b. Apply hierarchical clustering using complete linkage to yield two clusters from the presence/absence term-document matrix using all five of the most common terms from the reviews. How many documents are in each cluster? Give a description of each cluster.