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Workshop: Web Scraping and Text Mining with R

05.07.2018

by Dr. Simon Munzert (Hertie School of Governance)

To address the rising demand for new skills in gathering and analyzing text data from social media sources, the Chair for Empricial Research and Policy Analysis (Prof. Paul W. Thurner) organizes a two-day method-workshop.

Venue: Geschwister-Scholl-Institut, LMU Munich, Oettingenstr. 67, 80538 München

Date: July 16/17, 2018, 9am – 7pm

Outline

The rapid growth of the World Wide Web over the past two decades tremendously changed the way we share, collect and publish data. Firms, public institutions and private users provide every imaginable type of information and new channels of communication generate vast amounts of data on human behavior. What was once a fundamental problem for the social sciences—the scarcity and inaccessibility of observations—is quickly turning into an abundance of data. This turn of events does not come without problems. For example, traditional techniques for collecting and analyzing data may no longer suffice to overcome the tangled masses of data. One consequence of the need to make sense of such data has been the inception of ‘data scientists’,who sift through data and are greatly sought after by research and business alike. But how to efficiently collect data from the Internet and process the collected (text) data with statistical software? On the first day, we will learn how to scrape content from static and dynamic web pages, connect to APIs from popular web services to read out and process user data, and set up automatically working scraper programs. The second day is focused on quantitative text analysis. In particular, we learn how to work with text data in R, supervised text classification, and unsupervised topic modeling.

Prerequisites and Software

I strongly recommend to bring your own laptop. Furthermore, although no special knowledge of web technologies or programming languages is required, participants are expected to have applied knowledge of R. Ideally, areas you are familiar with include

  • data structures and basic vocabulary
  • data import and export with readr and haven or rio
  • data manipulation with dplyr
  • writing own functions

Before the course starts, you should make several preparations:

  1. make sure that the newest version of (available here) is installed on your computer
  2. install the newest stable version of RStudio (available here)
  3. Install the needed packages as outlined on the GitHub repository (see below)

Texts and Materials

The workshop is accompanied by the following book:


Munzert, Simon, Christian Rubba, Peter Meißner, and Dominic Nyhuis, 2015: Automated Data Collection with R. A Practical Guide to Web Scraping and Text Mining. Chichester: John Wiley& Sons.


Some things have changed since this book was published. I will make sure to cover packages that are most up-to-date in the R environment. In addition, more materials will be made available online on the following GitHub repository: https://github.com/simonmunzert/rscraping-munich-2018

Supplemental Literature

Other useful texts on R and web technologies include:

  • Nolan, Deborah, and Duncan Temple Lang, 2014: XML and Web Technologies for Data Sciences with R. New York: Springer.
  • Murrell, Paul, 2009: Introduction to Data Technologies. Chapman & Hall/CRC.
  • Gandrud, Christopher, 2015: Reproducible Research with R and RStudio. Chapman & Hall/CRC, 2nd Ed.
  • Wickham, Hadley, 2014: Advanced R. Chapman & Hall/CRC.
  • Grolemund, Garrett, and Hadley Wickham, 2016: R for Data Science. O’Reilly.


If you want to dig deeper into web and data technologies, you may want to consider the following books:

  • Beaulieu, Alan, 2009: Learning SQL. Sebastopol, CA: O’Reilly.
  • Cerami, Ethan, 2002: Web Services Essentials. Sebastopol, CA: O’Reilly.
  • Holdener III, Anthony T., 2008: Ajax: The Definitive Guide. Sebastopol, CA: O’Reilly.
  • Gourley, David, and Brian Totty, 2002: HTTP. The Definitive Guide. Sebastopol, CA: O’Reilly.
  • Crockford, Douglas, 2008: JavaScript: The Good Parts. Sebastopol, CA: O’Reilly

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