Monthly Archives: July 2011

A Quantstrat to Build On Part 6

July 5, 2011
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A Quantstrat to Build On Part 6

THIS IS NOT INVESTMENT ADVICE.  ACTING ON THIS MAY LOSE LOTS OF MONEY. In A Quantstrat to Build on Part 5, I promised some performance reporting on quantstrat portfolios, but then in REIT Momentum in Quantstrat, I discovered it is not nearly as ea...

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New R User Group in Argentina

July 5, 2011
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A new local R user group has formed in Buenos Aires, Argentina, under the succinct name ".aR". They're currently putting together the agenda for their first meeting, and are looking for speakers with expertise in the BioConductor project and Finance. If you'd like to join the group, check out the Spanish-language website for .aR, or follow @ar_usergroup on Twitter....

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Sentiment Analysis for Airlines via Twitter

July 5, 2011
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Sentiment Analysis for Airlines via Twitter

Last weekend here in the states was the 4th of July long weekend, one of the busier air travel days of the year. As anyone who flies in the States knows, with air travel often comes frustration, and in this social media age many express their frustration on Twitter: The image above comes from a tutorial on text mining...

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Example 9.1: Scatterplots with binning for large datasets

July 5, 2011
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Example 9.1: Scatterplots with binning for large datasets

Scatterplots can get very hard to interpret when displaying large datasets, as points inevitably overplot and can't be individually discerned. A number of approaches have been crafted to help with this problem. One approach uses binning. This approa...

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Another way to use R in Excel for .NET programmer

July 5, 2011
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Another way to use R in Excel for .NET programmer

As you know, RExcel give us a way to combine R with Excel.But, It just bothering to install some COMs and maybe not be programming but excel manipulation!If you are a .NET programmer, there is another way to call R from Excel.I would like to ...

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Different goals, different looks: Infovis and the Chris Rock effect

July 5, 2011
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Different goals, different looks:  Infovis and the Chris Rock effect

Seth writes: Here’s my candidate for bad graphic of the year: I studied it and learned nothing. I have no idea how they assigned colors to locations. I already knew that there were more within-city calls than calls to individual distant locations — for example that there are more SF-SF calls than SF-LA calls.

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In 4 Steps your Application (including R) is running on a Cloud Computing Cluster

In 4 Steps your Application (including R) is running on a Cloud Computing Cluster

Today, cloud computing is used in many application areas from academic research to industry. Commercial cloud providers as Amazon Web Services (AWS) advertise the simple and fast access to cloud computing resources. Posts in different blogs proof that you can get your application running in the cloud, but it will cost you more than 15

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Bounded target support

July 4, 2011
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Bounded target support

Here is an interesting question from Tomàs that echoes a lot of related emails: I’m turning to you for advice. I’m facing problem  where parameter space is bounded, e.g. all parameters have to be positive. If in MCMC as proposal distribution I use normal distribution, then at some iterations I get negative proposals. So my

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slides from my R tutorial on Twitter text mining #rstats

July 4, 2011
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slides from my R tutorial on Twitter text mining #rstats

Update: An expanded version of this tutorial will appear in the new Elsevier book Practical Text Mining and Statistical Analysis for Non-structured Text Data Applications by Gary Miner et. al which is now available for pre-order from Amazon. In conjunction with the book, I have cleaned up the tutorial code and published it on github.

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R.NET

July 4, 2011
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The R.NET project provides a mechanism for communicating with R from a .NET application. This appears to be a promising way to create simple interfaces to some of the functionality of R. Some examples of using R.NET can be found here and here.

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