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Rolf Fredheim
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Digital Data Collection course
Another year, another web scraping course. Taught through SSRMC at the University of Cambridge. Below are slides from all three sessions. In the course I tried to achieve the following: - Show how to connect R to resources online - Use loops and functions t...
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Better handling of JSON data in R?
What is the best way to read data in JSON format into R? Though really common for almost all modern online applications, JSON is not every R user's best friend. After seeing the slides for my Web Scraping course , in which I somewhat arbitrarily veered be...
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Web Scraping: working with APIs
APIs present researchers with a diverse set of data sources through a standardised access mechanism: send a pasted together HTTP request, receive JSON or XML in return. Today we tap into a range of APIs to get comfortable sending queries and processing resp...
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Web Scraping: Scaling up Digital Data Collection
The latest slides from web scraping through R: Web scraping for the humanities and social sciences Slides from the first session here Slides from the second session here This week we look in greater detail at scaling up digital data-collection: coercing scr...
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Should Ukraine and Russia be united?
New adventures in d3, this time with some Ukrainian polling data. According to a poll collected in the period 8-18 February, 13% of Ukrainians would wish for Ukraine to join Russia. The numbers all around seem pretty low, though newer data might present a d...
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Web Scraping part2: Digging deeper
Slides from the second web scraping through R session: Web scraping for the humanities and social sciences In which we make sure we are comfortable with functions, before looking at XPath queries to download data from newspaper articles. Examples including ...
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**
This is part 3 of the series about Nashi bots.  If doing this currently I would approach the problem differently, but to my knowledge NodeXL is still a viable way of accessing the Twitter API. Detecting Nashi’s bots Kambulov was hired to create and populate...
Quantifying Memory
Quantifying Memory
quantifyingmemory.blogspot.com
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Protests in Ukraine 18-20 February
The map below, based on data from here  shows where the people killed in the protests of 18-20 February came from.* I can't vouch for the accuracy of the data. Apparently most of the protesters killed in Kiev come from central regions and Lviv Oblast', almo...
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d3 without javascript
Here I show how to convert tabulated data into a json format that can be used in d3 graphics. The motivation for this was an attempt at getting an overview of topic models ( link ). Illustrations like the one to the right are very attractive; my motivation ...
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