Monthly Archives: February 2011

Vectorize!

February 20, 2011
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Vectorize!

Here is an email sent by one of my students a few days ago: Do you know how to integrate a function with an  “if”? For instance: >X=rnorm(100) >Femp=function(x){ +   return(sum(X<x)) +} >integrate(Femp,0,1)$value does not work. My reply was that the fundamental reason it does not work is that integrate (or curve for instance)

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Dataset: Tweets from the Chinese Protests #cn220

February 20, 2011
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Dataset: Tweets from the Chinese Protests #cn220

  Earlier this week, I posted a ~100k tweet dataset on the #25bahman protests in Iran.  The corresponding figure of frequencies showed a strong presence on Twitter, with over 500 tweets per 5 minute period at peak.  You can download the … Continue reading →

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New R features in Bio7 1.5

February 20, 2011
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New R features in Bio7 1.5

Bio7 1.5 has been released and comes with new functionalities for R. For all who don’t know Bio7 here is a short description: Bio7 is a integrated development environment for ecological modelling based on the Rich-Client-Platform concept of the Java IDE Eclipse. The Bio7 platform contains several perspectives which arrange several views for a special

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UseR! 2011 in Warwick

February 20, 2011
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UseR! 2011 in Warwick

This year useR! conference will take place in Warwick, on August 16-18.  It is being organised by the department of Statistics and funded by CRiSM and Revolution Analytics (providers of the R tee-shirt!). I wish I could attend but mid-August is usually associated with genuine (post-JSM) family vacations. Filed under: R, Statistics, University life Tagged:

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Talking R through Java

February 20, 2011
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Talking R through Java

Today I played a bit with JRI as part of rJava, a Java-R-interface. Here you can learn how to setup for Debian/Ubuntu/akins.

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Open-sourcing some of my automation code

February 19, 2011
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Open-sourcing some of my automation code

To automate my trading I use a mix of scripts. Everything goes – R, Python, shell, C++, etc. For some time now I have been satisfied with the tools I have created. They run once a day, gather data from EODDATA, update the database, run some R magic to decide what needs to be done

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Software tools for data analysis – an overview

February 19, 2011
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Software tools for data analysis – an overview

by Szilard Pafka Discussions on various software tools (C, C++, Perl, Python, Unix shell, R, Matlab, SAS, SPSS, Excel, databases, Hadoop etc.) used in data analysis. Szilard Pafka (founder and co-organizer of the Los Angeles R users group) presents an … Continue reading →

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Parallel computation [permutations]

February 19, 2011
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Parallel computation [permutations]

François Perron is visiting me for two months from Montréal and, following a discussion about the parallel implementation of MCMC algorithms—to which he also contributed with Yves Atchadé in 2005—, he remarked that a deterministic choice of permutations with the maximal contrast should do better than random or even half-random permutations. Assuming p processors or

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Screen Scraping, Mapping in R

February 19, 2011
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by Earl F. Glynn, Kansas Watchdog The PowerPoint slides below give an overview of screen scraping and mapping in R. Details with comments about many of the R statements can be found in these articles: Simple R Screen Scraping Example R Screen Scraping:...

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Working with multiple graphs in R

February 19, 2011
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Working with multiple graphs in R

I'm trying out screencasting to help illustrate some tips and tricks with the statistics software package R, but also to hone my skills in this area.I'm including the code for this example as an attachment to this post.I'm in the proces...

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