2124 search results for "twitter"

Dataset: Wisconsin Union Protester Tweets #wiunion

February 21, 2011
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Dataset: Wisconsin Union Protester Tweets #wiunion

   I’ve been playing with Twitter data over the last week, archiving Algerian, Egyptian, Iranian, and Chinese tweets.  I thought I’d bring the story a little closer to home this time by archiving tweets from Wisconsin Union protesters on the … Continue reading →

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Child health metrics

February 20, 2011
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Child health metrics

In analysis of Child Health data, generally z-scores or percentile groupings are used as children do not growth is not linear. The CDC (Center for Disease Control and Prevention) have released tables of data for calculating these z-scores and percentiles, and here are some scripts for R to calculate these in your sample. CLICK HERE

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R versus Matlab in Mathematical Psychology

February 20, 2011
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R versus Matlab in Mathematical Psychology

I recently attended the 2011 Australasian Mathematical Psychology Conference.This post summarises a few thoughts I had on the use of R, Matlab and othertools in mathematical psychology flowing from discussions with researchers atthe conference.I wanted...

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R versus Matlab in Mathematical Psychology

February 20, 2011
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I recently attended the 2011 Australasian Mathematical Psychology Conference. This post summarises a few thoughts I had on the use of R, Matlab and other tools in mathematical psychology flowing from discussions with researchers at the conference. I w...

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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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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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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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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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R Bloggers: The Site I Wish Existed in 2007

February 19, 2011
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R Bloggers: The Site I Wish Existed in 2007

  My first experience with R was in 2007 as a sophomore in undergrad.  As part of a larger project on pricing day-ahead electricity futures, I wanted to cluster locational marginal price (LMP) data from the ISO-NE.  Something like k-means is easy … Continue reading →

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