R-statistics blog

• Subscribe: Entries | Comments
• 

  
  

• Categories

  R R and the web R community R links statistics ubuntu visualization wordpress WordPress and Statistics

• Recent Posts

  • Interactive Graphics with the iplots Package (from “R in Action”)
  • Merging two data.frame objects while preserving the rows’ order
  • Aggregation and Restructuring data (from “R in Action”)
  • Top 20 R posts of 2011 (and some R-bloggers statistics)
  • data.frame objects in R (via “R in Action”)
  • UseR! 2011 slides and videos – on one page
  • edimax EW-7811Un USB wireless – connecting to a network (on ubuntu 11.10)
  • Diagram for a Bernoulli process (using R)
  • The present and future of the R blogosphere (~7 minute video from useR2011)
  • Comparison of ave, ddply and data.table

• Archives

  Select Month January 2012 December 2011 November 2011 October 2011 August 2011 June 2011 April 2011 March 2011 February 2011 January 2011 December 2010 October 2010 September 2010 August 2010 July 2010 June 2010 May 2010 April 2010 March 2010 February 2010 December 2009 October 2009 September 2009 July 2009 March 2009

• Tags

  ANOVA blog blogging cloud computing code community data.frame deducer fun ggplot2 GUI Hadley Wickham interfaces jeroen ooms machine learning non-parametric non-parametric test nonparametric nonparametric test Open source packages plyr R R bloggers r books R code R community R GUI R packages SPSS stackoverflow statistics survey syntax highlight tutorial tutorials useR useR2010 video visualization WebSites windows wordpress wordpress plugin youtube

• R-bloggers

  • Removing Multibyte Characters from Strings
    I was a bit annoyed by the error when loading a dataset that contains multi-byte characters. R basically just chokes on them. I have not really understood the intricacies of this, but it was basically just an annoyance and since I did not really use these characters in the strings containing them, I just wanted […]
  • Visual Summary of #jan25 Twitter Activity
      Last year, I covered a number of the so-called “Twitter protests” in China (#cn220), Iran (#25bahman), and Algeria (#fev12).  Since these protests began in January 2011, the Arab Spring has claimed many members of both ruling and revolting groups … Continue reading → […]
  • Multiple Factor Model – Fundamental Data
    The Multiple Factor Model can be used to decompose returns and calculate risk. Following are some examples of the Multiple Factor Models: The expected returns factor model: Commonality In The Determinants Of Expected Stock Returns by R. Haugen, N. Baker (1996) The expected returns factor model: CSFB Quantitative Research, Alpha Factor Framework on page 11, [ […]
  • Categorizing my expenses
    In order to analyse my expenses, a classification scheme is necessary. I need to identify categories that are meaningful to me. I decided to go with the “Classification of Individual Consumption by Purpose” (COICOP), for three reasons:It is made by... […]
  • Say it in R with "by", "apply" and friends
    Iris versicolor (Source: Wikipedia)R is a language, as Luis Apiolaza pointed out in his recent post. This is absolutely true, and learning a programming language is not much different from learning a foreign language. It takes time and a lot of pr... […]
  • Le Monde puzzle [#755?]
    Le Monde puzzle of last weekend was about sudoku-like matrices. Consider an (n,n) matrix containing the integers from 1 to n². The matrix is “friendly” if the set of the sums of the rows is equal to the set of the sum of the columns. Find examples for n=4,5,6. Why is there no friendly matrix […]
  • Replicating NetLogo Fire model
    While preparing for the new semester I have started reimplementing standard NetLogo examples in R. The first is Fire model.The simulation in R is presented here:# Forest matrix trees encoding:# 3 – green, 2 – burning, 1 – burnt, 0 – no treesimu... […]
  • Experimenting With iGraph – and a Hint Towards Ways of Measuring Engagement?
    For fear of being left way behind as Martin Hawksey starts to get to grips with R, (see for example how he’s using R to automate the annotation of Google Spreadsheets with calculations that don’t come readily or efficiently to hand in Google Spreadsheets itself), I thought I better try to get to grips with […]
  • New R User Group in Cleveland
    Another new local R user group has just started up, this time in Cleveland, OH. The Cleveland R User Group is the brainchild of R user Nicholas Hermez, and their first meeting on February 22 is a get-together to plan future topics, presenters and venues. If you're in the Cleveland area why not drop by and contribute your ideas? By the way, don't fo […]
  • Scraping Flora of North America
    So Flora of North America is an awesome collection of taxonomic information for plants across the continent. However, the information within is not easily machine readable. So, a little web scraping is called for. rfna is an R package to collect inf... […]