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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

Creating a corpus

You have created a tibble called russian_tweets that contains around 20,000 tweets auto generated by bots during the 2016 U.S. election cycle so that you can perform text analysis. However, when searching through the available options for performing the analysis you have chosen to do, you believe that the tm package offers the easiest path forward. In order to conduct the analysis, you first must create a corpus and attach potentially useful metadata.

Be aware that this is real data from Twitter and as such there is always a risk that it may contain profanity or other offensive content (in this exercise, and any following exercises that also use real Twitter data).

Instructions

100 XP
  • Create a corpus using the content column of russian_tweets.
  • Attach both the following and followers columns as metadata to tweet_corpus.
  • Print the first few rows of the metadata table.