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cm012.html
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<title>Getting data from the web: scraping</title>
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<h1 class="title toc-ignore">Getting data from the web: scraping</h1>
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<div id="cm012---november-2-2016" class="section level1">
<h1>cm012 - November 2, 2016</h1>
<div id="overview" class="section level2">
<h2>Overview</h2>
<ul>
<li>Identify methods for writing functions to interact with APIs</li>
<li>Define JSON and XML data structure and how to convert them to data frames</li>
<li>Define CSS selectors and practice writing selectors to extract information from web pages</li>
<li>Write a script to extract data on wineries in Ithaca, NY using <code>rvest</code> and the Selector Gadget</li>
</ul>
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<div id="slides-and-links" class="section level2">
<h2>Slides and links</h2>
<ul>
<li><a href="webdata02.html">Notes from class</a></li>
<li><p><a href="extras/cm012_slides.html">Slides</a></p></li>
<li><a href="https://cran.r-project.org/web/packages/httr/">Documentation for <code>httr</code></a></li>
<li><code>rvest</code>
<ul>
<li>Load the library (<code>library(rvest)</code>)</li>
<li><code>demo("tripadvisor")</code> - scraping a Trip Advisor page</li>
<li><code>demo("united")</code> - how to scrape a web page which requires a login</li>
<li><a href="https://blog.rstudio.org/2014/11/24/rvest-easy-web-scraping-with-r/">Scraping IMDB</a></li>
</ul></li>
<li>Python stuff
<ul>
<li><a href="webdata_api_py.html">Accessing APIs</a></li>
<li><a href="webdata_scrape_py.html">Scraping the web with <code>BeautifulSoup</code></a></li>
</ul></li>
</ul>
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<div id="to-do-for-monday" class="section level2">
<h2>To do for Monday</h2>
<ul>
<li><a href="hw06-webdata.html">Start homework 6</a></li>
<li>Chapters 1, 2, 3, and 4 in <a href="http://tidytextmining.com/"><em>Tidy Text Mining with R</em></a></li>
<li><a href="http://science.sciencemag.org.proxy.uchicago.edu/content/347/6227/1243.full">Wojcik, S. P., Hovasapian, A., Graham, J., Motyl, M., & Ditto, P. H. (2015). Conservatives report, but liberals display, greater happiness. <em>Science</em>, 347(6227), 1243-1246.</a></li>
</ul>
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<p>This work is licensed under the <a href="http://creativecommons.org/licenses/by-nc/4.0/">CC BY-NC 4.0 Creative Commons License</a>.</p>
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