Monthly Archives: June 2010

Statistical Analysis and Visualization of the Drug War in Mexico

June 15, 2010
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Statistical Analysis and Visualization of the Drug War in Mexico

On December 11, 2006 Felipe Calderon, as the first significant act of his presidency, sent the army to his home state of Michoacan. He claimed that it was to regain control of territories lost to the drug cartels, and indeed, a new cartel had started operating in Michocan. But the fact that he won the election by the slim margin of...

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RcppArmadillo 0.2.3

June 15, 2010
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The minor bug-fix release 0.2.3 of RcppArmadillo went to CRAN this morning. It adds a tiny bit of configuration to permit Sun Studio / suncc to successfully build the package. There is no code change, and no configuration change for the other platfo...

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New R User Group in Kassel, Germany

June 15, 2010
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There's yet another local R user group launching this week, this time in Kassell, in central Germany. Their first meeting is on June 24. If my rusty German is holding up, looks like there will be some good discussion on editors and GUIs, how to find packages and functions, and R community resources. There's been lots of activity in...

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R for Matlab Users

My favorite software is Matlab, but partly because R is free, more and more people & companies choose to use R as a major working language. Nothing wrong with that, I am at the moment changing some of my Kalman Filter Matlab codes to R.One bothering issue is each software has its own...

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Faster R through better BLAS

June 15, 2010
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Faster R through better BLAS

Can we make our analysis using the R statistical computing and analysis platform run faster? Usually the answer is yes, and the best way is to improve your algorithm and variable selection. But recently David Smith was suggesting that a big benefit of their (commercial) version of R...

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Clustergram: visualization and diagnostics for cluster analysis (R code)

June 15, 2010
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Clustergram: visualization and diagnostics for cluster analysis (R code)

About Clustergrams In 2002, Matthias Schonlau published in “The Stata Journal” an article named “The Clustergram: A graph for visualizing hierarchical and . As explained in the abstract: In hierarchical cluster analysis dendrogram graphs are used to visualize how clusters are formed. I propose an alternative graph named โ€œclustergramโ€ to examine how cluster members are assigned to clusters as...

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plagiarism exposed!

June 14, 2010
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plagiarism exposed!

Last morn, I had the surprise of receiving the following email: This is to inform you that the following abstract has been submitted to the 3rd International Conference of the ERCIM WG on COMPUTING & STATISTICS (ERCIM’10) Ab#: 114 Title: Goodness of Fit Via Mixtures of Beta distributions Keywords: nonparametric estimation, posterior conditional predictive p-value.

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StatEt in Ubuntu 10.04

June 14, 2010
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I wanted a “lightweight” version of Eclipse to run R from Ubuntu. (I installed eclipse-pde using apt-get. It worked fine.) Once it was running, I installed StatEt via the “Install new software” feature from http://download.walware.de/eclipse-3.5. While it was downloading, I … Continue reading →

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New R User Groups in Sydney, South Asia

June 14, 2010
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For R users in the Southern Hemisphere on the other side of the Prime Meridian, there are two new entries in the Local R User Group Directory: Sydney and South Asia. The Sydney group wins the prize for the best group acronym ever: SURF. The Sydney Users of R Forum will have their welcome meeting on July 6 July...

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Repulsive dots pattern, the difference of distance

June 14, 2010
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Repulsive dots pattern, the difference of distance

What if you wanted to randomly place objects into a field, and the more objects you had, the more they rejected newcomers placed nearby? To find out, I setup a simulation. The code, shown at the end, isn’t all that interesting, and the plots shown below aren’t all that special. I think there is one

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