Monthly Archives: June 2011

Always learn and never know

June 3, 2011
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Always learn and never know

I have been using R for about two years, with no previous coding background. So, I feel like the title says, “always learn and never know”. This time, I decided to use R to study a simple, non-statistical problem that came up some time ago. Suppose the exponential function 2^x and the parabola x^2. One

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Merge all files in a directory using R into a single dataframe

June 3, 2011
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Merge all files in a directory using R into a single dataframe

In this post, I provide a simple script for merging a set of files in a directory into a single, …Continue reading »

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Optmatch and RItools — New homes and techniques

June 2, 2011
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Co-developers Jake Bowers, Ben Hansen and I are happy to announce that our R packages optmatch and RItools have new homes on GitHub. We had previously been managing development on private subversion repositories and managed the projects through an ad-h...

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A Quantstrat to Build On

June 2, 2011
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A Quantstrat to Build On

THIS IS NOT INVESTMENT ADVICE.  PLEASE DO NOT TRADE THIS SYSTEM AS IT CAN LOSE SIGNIFICANT AMOUNTS OF MONEY.  YOU ARE RESPONSIBLE FOR YOUR OWN GAINS AND LOSSES. Some R finance powerhouses have been banging away on the quantstrat package for q...

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Highlights from R/Finance 2011 presentations

June 2, 2011
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Patrick Burns offers his selections from the presentations at the R/Finance 2011 conference. Check out his post for overviews of some great presentations (and truly, there's some awesome content available to download). I'll add another of my favourites: Bryan Lewis's presentation of his interface from R to the betfair betting market. (But if you use it to automate bets...

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Australians and Americans, 10 years after 9/11

June 2, 2011
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With Lynn Vavreck at UCLA, I ran parallel public opinion surveys in Australia and the United States, measuring attitudes on security, the fight against terrorism, the wars in Afghanistan etc, some 10 years after the 9/11 attacks. Full report here (gene...

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Sweave diagram, following Knuth’s original

June 2, 2011
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Sweave diagram, following Knuth’s original

In preparation for a talk, I updated Knuth's original diagram in Donald E. Knuth. Literate programming. The Computer Journal, 27(2):97–111, May 1984. The new diagram is Sweave specific. Click the Sweave diagram for a PDF version, or right-click and select 'save image as' for the PNG version. Permission is granted for any use of the

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Selections from the R/Finance conference

June 2, 2011
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Selections from the R/Finance conference

The R/Finance conference happened in Chicago at the end of April.  If, like me, you weren’t there, you can still benefit from it because slides from many of the talks are now online. Here is a quick synopsis (in chronological order) of some of the talks I found most interesting. Michael Kane Michael Kane and … Continue reading...

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Annual Returns by State of the US Economy

June 1, 2011
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Annual Returns by State of the US Economy

Sometimes it is fun to just look at annual returns, especially as the financial world has shifted its focus to microseconds in a world of inconceivable macro imbalances.  St. Louis Fed (USREC) offers a binary state of the economy with 1=recession ...

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Kaggle Competition Walkthrough: Wrapup

June 1, 2011
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Kaggle Competition Walkthrough: Wrapup

The Kaggle Don't Overfit competition is over, and I took 11th place! Additionally, I tied with tks for contributing the most to the forum, so thanks to everyone who voted for me! I voted for tks, and I'm very happy to share the prize with him, as most...

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