Automated Data Collection with R

Automated Data Collection with R

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A hands on guide to web scraping and text mining for both beginners and experienced users of R Introduces fundamental concepts of the main architecture of the web and databases and covers HTTP, HTML, XML, JSON, SQL. Provides basic techniques to query web documents and data sets (XPath and regular expressions). An extensive set of exercises are presented to guide the reader through each technique. Explores both supervised and unsupervised techniques as well as advanced techniques such as data scraping and text management. Case studies are featured throughout along with examples for each technique presented. R code and solutions to exercises featured in the book are provided on a supporting website.MANAGING DATA PROJECTS 323 Table 11.1 Basic R functions for folder and file management Function Important arguments ... path Returns logical value whether a file already exists in path file.access() names, mode Tests files in names for existence (mode=0), ... to Renames a file in path from to a name in to file.remove() path Deletes a file in path from the hard drive file.append() file1, file2 ... A frequently encountered task in web scraping is executing a piece of code repeatedly.


Title:Automated Data Collection with R
Author: Simon Munzert, Christian Rubba, Peter Meißner, Dominic Nyhuis
Publisher:John Wiley & Sons - 2014-12-18
ISBN-13:

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