JOHANNES LEDOLTER has professorships in both the Business School, where he is Robert Thomas Holmes Professor of Business Analytics, and in the Department of Statistics and Actuarial Science at the University of Iowa. He is a Fellow of the American Statistical Association and the American Society for Quality, and Elected Member of the International Statistical Institute. He is the author of several books, including Statistical Methods for Forecasting, Introduction to Regression Modeling, Testing 1-2-3: Experimental Design with Applications in Marketing and Service Operations, and Data Mining and Business Analytics with R. He was Professor of Statistics at the Vienna University of Economics and Business from 1997 to 2015, and held visiting professorships at Princeton, Yale, Stanford and the University of Chicago. Since 2011, he has been Associate Investigator at the Center for Prevention and Treatment of Vision Loss at the Iowa City VA Health Care System, which studies optic nerve and retinal disorders in relation to traumatic brain injury. Professor Ledolter enjoys working on multi-disciplinary projects that involve both numeric and text information.

Series Editor's Introduction
Preface
Acknowledgments
About the Authors
Chapter 1: Introduction
1.1 Text Data
1.2 The Two Applications Considered in This Book
1.3 Introductory Example and Its Analysis Using the R Statistical Software
1.4 The Introductory Example Revisited, Illustrating Concordance and Collocation Using Alternative Software
1.5 Concluding Remarks
1.6 References
Chapter 2: A Description of the Studied Text Corpora and A Discussion of Our Modeling Strategy
2.1 Introduction to the Corpora: Selecting the Texts
2.2 Debates of the 39th U.S. Congress, as recorded in the Congressional Globe
2.3 The Territorial Papers of the United States
2.4 Analyzing Text Data: Bottom-Up or Top-Down Analysis
2.5 References
Appendix to Chapter 2: The Complete Congressional Record
Chapter 3: Preparing Text for Analysis: Text Cleaning and Formatting
3.1 Text Cleaning
3.2 Text Formatting
3.3 Concluding Remarks
3.4 References
Chapter 4: Word Distributions: Document-Term Matrices of Word Frequencies and the "Bag of Words" Representation
4.1 Document-Term Matrices of Frequencies
4.2 Displaying Word Frequencies
4.3 Co-Occurrence of Terms in the Same Document
4.4 The Zipf Law: An Interesting Fact About the Distribution of Word Frequencies
4.5 References
Chapter 5: Metavariables and Text Analysis Stratified on Metavariables
5.1 The Significance of Stratification and the Importance of Metavariables
5.2 Analysis of the Territorial Papers
5.3 Analysis of Speeches From the 39th Congress
5.4 References
Chapter 6: Sentiment Analysis
6.1 Lexicons of Sentiment-Charged Words
6.2 Applying Sentiment Analysis to the Letters of the Territorial Papers
6.3 Using Other Sentiment Dictionaries and the R Software tidytext for Sentiment Analysis
6.4 Concluding Remarks: An Alternative Approach for Sentiment Analysis
6.5 References
Chapter 7: Clustering of Documents
7.1 Clustering Documents
7.2 Measures for the Closeness and the Distance of Documents
7.3 Methods for Clustering Documents
7.4 Illustrating Clustering Methods on a Simulated Example
7.5 References
Chapter 8: Classification of Documents
8.1 Introduction
8.2 Classification Procedures
8.3 Two Examples Using the Congressional Speech Database
8.4 Concluding Remarks on Authorship Attribution: Commenting on the Field of Stylometry
8.5 References
Chapter 9: Modeling Text Data: Topic Models
9.1 Topic Models
9.2 Fitting Topic Models to the Two Corpora Studied in This Book
9.3 References
Chapter 10: n-Grams and Other Ways of Analyzing Adjacent Words
10.1 Analysis of Bigrams
10.2 Text Windows to Measure Word Associations Within a Neighborhood of Words and a Discussion of the R Package text2vec
10.3 Illustrating the Use of n-Grams: Speeches of the 39th Congress
Chapter 11: Concluding Remarks
Appendix: Listing of Website Resources