Posts Tagged ‘ R ’

Weekend Reading – Facebook’s P/E ratio

October 7, 2012
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Weekend Reading – Facebook’s P/E ratio

The Barron’s article Still Too Pricey by Andrew Bary looks at the share price of the Facebook and based on the P/E ration valuation metrics concludes that even at the current prices, stock is overvalued. I want to show how to do this type of fundamental analysis using the Systematic Investor Toolbox. First let’s load

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Style your R charts like the Economist, Tableau … or XKCD

October 5, 2012
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Style your R charts like the Economist, Tableau … or XKCD

As we noted last month, the new Themes feature in ggplot2 helps you customize the design of R charts to your liking. Now, R user Jeffrey Arnold has built on this feature to create standardized themes to make R graphics looks like those from major publications and other software systems. You can use his ggthemes package to make your...

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DIY ZeroAccess GeoIP Plots

October 5, 2012
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DIY ZeroAccess GeoIP Plots

Since F-Secure was #spiffy enough to provide us with GeoIP data for mapping the scope of the ZeroAccess botnet, I thought that some aspiring infosec data scientists might want to see how to use something besides Google Maps & Google Earth to view the data. If you look at the CSV file, it’s formatted as

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Permanent Portfolio – Simple Tools

October 4, 2012
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Permanent Portfolio – Simple Tools

I have previously described and back-tested the Permanent Portfolio strategy based on the series of posts at the GestaltU blog. Today I want to show how we can improve the Permanent Portfolio strategy perfromance using following simple tools: Volatility targeting Risk allocation Tactical market filter First, let’s load the historical prices for the stocks(SPY), gold(GLD),

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Improving the integration between R and Hadoop: rmr 2.0 released

October 4, 2012
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The RHadoop project, the open-source project supported by Revolution Analytics to integrate R and Hadoop, continues to evolve. Now available is version 2 of the rmr package, which makes it possible for R programmers to write map-reduce tasks in the R language, and have them run within the Hadoop cluster. This update is the "simplest and fastest rmr yet",...

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Presidential Debates with qdap-beta

October 4, 2012
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Presidential Debates with qdap-beta

qdap brief intro For the past year I’ve been working on a package (qdap) to assist my field in quantitative discourse analysis; basically looking at patterns in language. It’s still a ways from being finished and lacks documentation (roxygen2 is … Continue reading →

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Tips on accessing data from various sources with R

October 3, 2012
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Jeffrey Breen (the man behind the Twitter airline sentiment analysis example) recently posted a collection of slides with some great tips for accessing data from R. "Tapping the Data Deluge" includes information on: Using the XLConnect package to read data from Excel spreadsheets Using the foreign package to read SPSS, SAS, Stata and dBase data files Using SQL queries...

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Emerging as Low Vol

October 2, 2012
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Emerging as Low Vol

Extending the series begun with When Russell 2000 is Low Vol, I thought I should take a look at Emerging Market stocks during periods of low relative volatility to the S&P 500.  So you can replicate even without access to expensive data, let

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R 2.15.2 scheduled for October 26

October 2, 2012
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The next minor update to R — version 2.15.2 "Trick or Treat" — will be released on October 26, R-core member Peter Dalgaard announced today. You can find the planned updates in the current NEWS file (scroll down to the section 'CHANGES IN R VERSION 2.15.1 patched'; the changes at the top of the file are planned for the...

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Connecting the real world to R with an Arduino

October 2, 2012
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Connecting the real world to R with an Arduino

If connecting data to the real world is the next sexy job, then how do I do this? And how do I connect the real world to R? It can be done as Matt Shottwell showed with his home made ECG and a patched version of R at useR! 2011. However, there are ot...

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