Monthly Archives: April 2010

Interview with Revolution CEO Norman Nie

April 28, 2010
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Steve Miller has posted his interview with Revolution's CEO Norman Nie at Information Management blogs. In the interview, Steve digs into Norman's motivations for taking on a new venture around R after his successes with SPSS and how what he learned there applies to Revolution Computing. Also up for discussion: the benefits and challenges of an open-source business model;...

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Bhapkar V test

April 28, 2010
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This is the code to perform the Bhapkar V test. I've rapidly wrote it, in 2 hours. The code is then quite brutal and it could be done better. As soon as possible, I will correct it.WARNING: it works *ONLY* with 3 groups, for now!bhapkar.test.3g sample for(i in 1:length(data1)){sample }obs for(i in 1:length(data1)){obs }rank cplets vec for(i in 1:length(data1])){vec...

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Bhapkar V test

April 28, 2010
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This is the code to perform the Bhapkar V test. I've rapidly wrote it, in 2 hours. The code is then quite brutal and it could be done better. As soon as possible, I will correct it.WARNING: it works *ONLY* with 3 groups, for now!bhapkar.test.3g sample for(i in 1:length(data1)){sample }obs for(i in 1:length(data1)){obs }rank cplets vec for(i in 1:length(data1])){vec...

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Social Network Analysis using R and Gephis

April 28, 2010
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Social Network Analysis using R and Gephis

After learning the basics of R, I decided to learn something harder last week. I picked Social Network Analysis (SNA) to learn the concepts of SNA and R. My primary interest in SNA is visual exploration of networks, so I needed to find a tool first.&n...

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Transitions in R redux

April 28, 2010
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Previously, I shared with the world a function to create a pairwise matrix of the number of transitions and transversions between two DNA sequences. Klaus Schliep kindly pointed out the possibility of a bug in the function and offered a faster, more accurate version. Thanks Klaus!titv mat res for(i...

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Transitions in R redux

April 28, 2010
By

Previously, I shared with the world a function to create a pairwise matrix of the number of transitions and transversions between two DNA sequences. Klaus Schliep kindly pointed out the possibility of a bug in the function and offered a faster, more accurate version. Thanks Klaus! titv mat res for(i...

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Climate Oscillations and GISS Temperature Anomaly Trends

April 27, 2010
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Climate Oscillations and GISS Temperature Anomaly Trends

In this post, I examine the combined impacts of Pacific Decadal Oscillation (PDO), Atlantic Multidecadal Oscillation (AMO) and El Nino – Southern Oscillation (ENSO)   on the long-term GISS Land and Ocean Temperature Anomaly (LOTA) trend. Introduction Professor Don Easterbrook of … Continue reading →

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Using R for Introductory Statistics, Chapters 1 and 2

April 27, 2010
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Using R for Introductory Statistics, Chapters 1 and 2

I'm working my way through Using R for Introductory Statistics, by John Verzani, a free version of which is available as SimpleR. Chapter 1 ...covers basics of R such as arithmetic, loading libraries and reading data. We also get an introduction to v...

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How to do this graph using R

April 26, 2010
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How to do this graph using R

I am showing three examples that will help an average R user to create beautiful graphs. The interesting (may be useful) parts of these examples are the use of some very smart but tricky functions to, for example, add a Greek symbol on a plot, add a title to a plot with some mathematical symbols. I am showing three...

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R Project and Google Summer of Code: Welcome to our students!

April 26, 2010
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A few hours ago, I sent the following to both the R development list and the informal R / GSoC list: Date: Mon, 26 Apr 2010 15:27:29 -0500 To: R Development List CC: gsoc-r Subject: R and the Google Summer of Code 2010 -- Please welcome our new st...

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