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  3. Introduction to Natural Language Processing in R
  • 1

    True Fundamentals

    Free

    Chapter 1 of Introduction to Natural Langauge Processing prepares you for running your first analysis on text. You will explore regular expressions and tokenization, two of the most common components of most analysis tasks. With regular expressions, you can search for any pattern you can think of, and with tokenization, you can prepare and clean text for more sophisticated analysis. This chapter is necessary for tackling the techniques we will learn in the remaining chapters of this course.

  • 2

    Representations of Text

    In this chapter, you will learn the most common and studied ways to analyze text. You will look at creating a text corpus, expanding a bag-of-words representation into a TFIDF matrix, and use cosine-similarity metrics to determine how similar two pieces of text are to each other. You build on your foundations for practicing NLP before you dive into applications of NLP in chapters 3 and 4.

  • 3

    Applications: Classification and Topic Modeling

    Chapter 3 focuses on two common text analysis approaches, classification modeling, and topic modeling. If you are working on text analysis projects, you will inevitably use one or both of these methods. This chapter teaches you how to perform both techniques and provides insight into how to approach these techniques from a practical point of you.

  • 4

    Advanced Techniques

    In chapter 4 we cover two staples of natural language processing, sentiment analysis, and word embeddings. These are two analysis techniques that are a must for anyone learning the fundamentals of text analysis. Furthermore, you will briefly learn about BERT, part-of-speech tagging, and named entity recognition. Almost 15 different analysis techniques were covered in this course, so chapter 4 ends by recapping all of the great techniques you will learn about in this course.

Initializing

Exercise

Cosine similarity example

The plot of Animal Farm is pretty simple. In the beginning the animals are unhappy with following their human leaders. In the middle they overthrow those leaders, and in the end they become unhappy with the animals that eventually became their new leaders.

If done correctly, cosine similarity can help identify documents (chapters) that are similar to each other. In this exercise, you will identify similar chapters in Animal Farm. Odds are, chapter 1 (the beginning) and chapter 10 (the end) will be similar.

Instructions 1/4

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  • Remove stop words from the text_column of animal_farm.