In the last two posts we saw how to download posts from R-bloggers, and then extract the title, author and date of each post and write that information to a csv file. Since we now have a nice data set from r-bloggers, we can start to examine the develo... [Read more...]

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Unfortunately, due to the vexing complexities of academic style guides and the limitations of associated software packages, citing a non-standard name, such as Cher, Prince, or R Development Core Team can be problematic. Thankfully, I have discovered a... [Read more...]

If you've been following the presidential primary process here in the US, you've probably seen many maps of the results of the Iowa caucuses by now (such as this infamous one from Fox News). But you might be interested to learn how such maps can be made using the R ... [Read more...]

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In 1854 there was a massive cholera outbreak in Soho, London – in three days over 120 people died from the disease. Famously, John Snow plotted the locations of the deaths on a map and found they clustered around a pump in Broad Street – he suggested that the pump be taken out of ... [Read more...]

There are only really two ways to preserve your statistical analyses. You either save the variables that you create, or you save the code that you used to create them. In general the latter is much preferred because at some point you’ll realise that your model was wrong, or ... [Read more...]

Quantum Financier wrote an interesting article Regime Switching System Using Volatility Forecast. The article presents an elegant algorithm to switch between mean-reversion and trend-following strategies based on the market volatility. Two model are examined: one using the historical volatility and another using the Garch(1,1) Volatility Forecast. The mean-reversion strategy is ... [Read more...]

In my previous post I showed how to write a small simple python script to download the pages of R-bloggers.com. If you followed that post and ran the script, you should have a folder on your hard drive with 2409 .html files labeled post1.html , post2.... [Read more...]

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in the last post i showed how to get the nominal north east atlantic landings data from 1950 onwards into a usable format in R. this time around a script that shows how to import zipped excel files from 1903 to 1949 is provided. finalizing with a ggplo... [Read more...]

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PrologueAfter 3 semesters of studying economics at IGIDR, the basics of macroeconomics still elude me. What policy shifts what curve? What determines the slope of IS-LM and AD-AS curves? What exactly was Keynes contribution to Economics? How do all the... [Read more...]

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Revolution Analytics is hiring! We're looking for a Sales Engineer -- someone who can show Revolution R to potential customers and really show off what R can do in an applied setting. (Fun fact: this was my first job when I left university, and it's a lot of fun.) The ... [Read more...]

R, just like other programming languages, has different types of objects. Matrices, arrays, data.frames, lists, vectors, tables, etc. But by far the most important for working with baseball data is going to be dataframes.I'm not sure of the level of ex... [Read more...]

Farhad Manjoo at Slate has a good article on why you need to learn how to program. Chances are, if you're reading this post here you're already fairly adept at some form of programming. But if you're not, you should give it some serious thought.Gina Trapani, former editor of ... [Read more...]

I saw the release of a new version of twitteR package a few weeks back and thought I should be testing the code I wrote some time ago but also do something interesting at the same time. Thus I came up with the idea of checking out how Presidents are ... [Read more...]