Download Automated Data Collection with R: A Practical Guide to Web by Simon Munzert PDF

By Simon Munzert

A palms on consultant to net scraping and textual content mining for either newcomers and skilled clients of R

  • Introduces basic suggestions of the most structure of the net and databases and covers HTTP, HTML, XML, JSON, SQL.
  • Provides uncomplicated strategies to question internet files and knowledge units (XPath and standard expressions).
  • An vast set of workouts are presented to advisor the reader via each one technique.
  • Explores either supervised and unsupervised recommendations in addition to complex concepts similar to info scraping and textual content management.
  • Case stories are featured all through besides examples for every approach presented.
  • R code and solutions to workouts featured in the booklet are supplied on a aiding website.

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Additional resources for Automated Data Collection with R: A Practical Guide to Web Scraping and Text Mining

Example text

One could speculate that the committee may be well aware of these facts and might use the list as a political means to enforce protection of the sites. Now take a few minutes and experiment with the gathered data for yourself! Which is the country with the most endangered sites? How effective is the List of World Heritage Sites in Danger? There is another table on the Wikipedia page that has information about previously listed sites. You might want to scrape these data as well and incorporate them into the map.

2 The metadata tag The tag is an empty tag written in the head element of an HTML document. elements do not have to be closed and thus differ from the general rule that empty elements have to be closed with a dash /. As the name already suggests, provides meta information on the HTML document and answers questions like: Who is the author of the document? Which encoding scheme is used? Are there any keywords characterizing the page? What is the language of the document?

While some studies find that Wikipedia is comparable to established encyclopedias (Chesney 2006; Giles 2005; Reavley et al. 2012), others suggest that the quality might, at times, be inferior (Clauson et al. 2008; Leithner et al. 2010; Rector 2008). But how do you know when relying on one specific article? It is always recommended to find a second source and to compare the content. 1. We acknowledge the work, but want to be able to generate such output ourselves. What is the primary source of secondary data?

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