Text Editors in The Lord of the Rings

July 29, 2011
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Text Editors in The Lord of the Rings

Prompted by a passing thought about TextMate, I thought I'd make a comprehensive, accurate, unbiased, and irrefutable survey of text editors by way of comparison to locations in The Lord of the Rings. TextMate: Minas Tirith A once-great but now decaying city. Only the King has the power to renew it, but he is a long absent, indeed...

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Text Editors in The Lord of the Rings

July 29, 2011
By
Text Editors in The Lord of the Rings

Prompted by a passing thought about TextMate, I thought I’d make a comprehensive, accurate, unbiased, and irrefutable survey of text editors by way of comparison to locations in The Lord of the Rings. TextMate: Minas Tirith A quiet, long-overlooked land populated by simple folk who keep mostly to themselves. They are somewhat set in their

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NppToR 2.6.0 beta 2

July 29, 2011
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http://sourceforge.net/projects/npptor/files/npptor%20installer/NppToR-2.6.0.beta2.exe/download I’ve released beta 2 of NppToR 2.6.0.  Please take a look and report any problems.  This improves the installer and the uninstaller as well as a few bugs that popped up from the transition to UNICODE.

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The Road to Default: Whaa???

July 29, 2011
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The Road to Default: Whaa???

Okay so here is what has been happening:The yield curve has been going through a mad flattening- indicating that investors are "flying to safety" and that a recession may be looming around the corner. Why has it been flattening? Well, a string of bad n...

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multi-platform real-time ‘intro’ in R using rdyncall

July 29, 2011
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multi-platform real-time ‘intro’ in R using rdyncall

Guest post by Daniel Adler. Below is a real-time audio-visual multimedia demonstration – or in short ‘an intro’ – written in 100% pure R. It requires no compilation and runs across major platforms via the package rdyncall and preinstalled precompiled standard libraries such as OpenGL and SDL libraries. This ‘happy-birthday’ production runs about 3 minutes

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Financial Engineering with R

July 29, 2011
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At the InformationManagement blog, Steve Miller talks about the applications of R to financial engineering, and reviews David Ruppert's book Statistics and Data Analysis for Financial Engineering. InformationManagement: Statistics and Financial Engineering

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Infovis vs. statgraphics: A clear example of their different goals

July 29, 2011
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Infovis vs. statgraphics:  A clear example of their different goals

I recently came across a data visualization that perfectly demonstrates the difference between the “infovis” and “statgraphics” perspectives. Here’s the image (link from Tyler Cowen): That’s the infovis. The statgraphic version would simply be a dotplot, something like this: (I purposely used the default settings in R with only minor modifications here to demonstrate what The post Infovis...

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[R][ggplot2][R-bloggers]RcmdrPlugin.KMggplot2_0.0-3 is on CRAN now

July 28, 2011
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[R][ggplot2][R-bloggers]RcmdrPlugin.KMggplot2_0.0-3 is on CRAN now

RcmdrPlugin.KMggplot2 (CRAN) I posted an Rcmdr plug-in for a ”ggplot2” GUI front-end on CRAN. This version supports Kaplan-Meier plot and other plots as follow: Kaplan-Meier plot Show no. at risk on inside Show no. at risk table on outside Histogram Colo

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Text Editors in The Lord of the Rings

July 28, 2011
By
Text Editors in The Lord of the Rings

Prompted by a passing thought about TextMate, I thought I’d make a comprehensive, accurate, unbiased, and irrefutable survey of text editors by way of comparison to locations in The Lord of the Rings. TextMate: Minas Tirith A once-great but now decaying city. Only the King has the power to renew it, but he is a long absent, indeed...

Read more »

Challenge alert — material identification

July 28, 2011
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Challenge alert — material identification

We start yet another series of post — challenge alerts. This series is intended to share news about machine learning or data mining challenges which may be interesting to the members of our community, possibly with some brief introduction to the problem. So if you hear about some contest, notify us on Skewed distribution. Today

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Le Monde puzzle [#29]

July 28, 2011
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Le Monde puzzle [#29]

This week, the puzzle from the weekend edition of Le Monde was easy to state: in the sequence (8+17n), is there a 6th power? a 7th? an 8th? If so, give the first occurrence. So I first wrote an R code for a function testing whether an integer is any power: (The function returns the

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Pattern Recognition: forward Boxplot Trajectories using R

July 28, 2011
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Pattern  Recognition: forward Boxplot Trajectories using R

Although the following discussion can apply to the Quantitative Candlestick Pattern Recognition series, it is addressing the same issue as any basic conditional type system -- how and when to exit.  The following is one way to visualize and think ...

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Program for useR! 2011 available

July 28, 2011
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The final program for the worldwide user conference, useR! 2011, is now available as a downloadable booklet (PDF, 7Mb). Revolution Analytics is very proud to sponsor this annual gathering of R users from around the world, and the program includes an outstanding lineup of speakers from the R Core Group, package developers, users in industry and academia, and the...

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Tweets vs. Likes: What gets shared on Twitter vs. Facebook?

July 28, 2011
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Tweets vs. Likes: What gets shared on Twitter vs. Facebook?

It always strikes me as curious that some posts get a lot of love on Twitter, while others get many more shares on Facebook: What accounts for this difference? Some of it is surely site-dependent: maybe one blogger has a Facebook page but not a Twitter account, while another has these roles reversed. But even

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Getting rid of white space at the beginning and end of a string

July 28, 2011
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There are situations where we are working with character strings extracted from various sources and it can be annoying when there is white space at the beginning and/or end of the strings. This whitespace can cause problems when attemping to sort, subset or various other common operations. The stringr package has a handy function str_trim

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I can’t resist a word cloud: now using R!

July 28, 2011
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I can’t resist a word cloud: now using R!

The wordcloud package is word clouds for R with a difference: they look great. Of course, having just analysed online coverage of the ISMB conference, I had to run all 6 906 comments from the 2008-2011 meetings through some code. If you followed along via the Sweave code, I went as far as generating the

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More S&P 500 correlation

July 28, 2011
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More S&P 500 correlation

Here are some additions to the previous post on S&P 500 correlation. Correlation distribution Before we only looked at mean correlations.  However, it is possible to see more of the distribution than just the mean.  Figures 1 and 2 show several quantiles: 10%, 25%, 50%, 75%, 90%. Figure 1: Quantiles of 50-day rolling correlation of … Continue reading...

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Displaying Missouri sex offender/child day care facility proximity map using batchgeo.com

July 28, 2011
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Computer Assisted Reporting This is the last of four articles about analyzing distances between sex offenders and child daycare centers in Missouri as part of a joint project with KSHB NBC Action News in Kansas City. The previous two articles gave deta...

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Marketing optimization using the nonlinear minimization function nlm

July 28, 2011
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Guest post by Bob Agnew ([email protected]) —————- Introduction Marketing optimization consists of assigning offers to prospects in order to maximize total expected profit subject to a few general linear constraints and the requirement that a prospect receives at most one offer.  What distinguishes these problems is their sheer size.  With millions of prospects, brute force linear solvers are unsuitable. ...

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Computing distance matrix between Missouri sex offenders and child daycare facilities

July 28, 2011
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Computer Assisted Reporting This is the third of four articles about analyzing distances between sex offenders and child daycare centers in Missouri as part of a joint project with KSHB NBC Action News in Kansas City. The previous article explained how...

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Core not in CiRM

July 27, 2011
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Core not in CiRM

Despite not enjoying this year the optimal environment of CiRM, we are still making good progress on the revision (or the R vision) of Bayesian Core. In the past two days, we went over Chapters 1 (Introduction), 2 (Normal Models), 5 (Capture-Recapture Experiments), and 6 (Mixture Models), with Chapters 3 (Regression), 4 (Generalised Linear Models)

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Creating Financial Instrument metadata in R

July 27, 2011
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(This is a guest post by Ilya Kipnis)When trading stocks in a single currency, instrument metadata can be safely ignored because the multiplier is 1 and the currencies are all the same.  When doing analysis on fixed income products, options, futures, or other complex derivative instruments, the data defining the properties of these instruments becomes critical to tasks...

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Join the Reserves

July 27, 2011
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Join the Reserves

Most forget that the tremendous macro imbalances caused by the 10 Trillion in foreign reserves are just 14 years old phenomenon but the results have been and will be profound.  The buying started after the Asia Pacific collapse of 1997, and the As...

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Analysis of ISMB coverage at FriendFeed: 2008 – 2011

July 27, 2011
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Analysis of ISMB coverage at FriendFeed: 2008 – 2011

ISMB/ECCB 2011 was held between July 15-19 this year and as in previous years, FriendFeed was used to cover the meeting. Last year, I wrote a post about how to use R to analyse the coverage. I was planning something similar for 2011 when I thought: we have 4 years of ISMB at FriendFeed now

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A Currency Graph

July 27, 2011
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A Currency Graph

Here's a graph in which nodes (and edges) represent currencies (and exchange rates):library(igraph)currencies <- factor(c("EUR", "USD", "JPY", "GBP"))df <- subset(expand.grid(from=currencies, to=currencies), from != to)GetExchangeRate...

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Adding Sweave.sty and Rd.sty to your LaTeX path in Mac OS X

July 27, 2011
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Adding Sweave.sty and Rd.sty to your LaTeX path in Mac OS X

Okay, this extremely specific, but a headache that must be solved if you plan to create or modify R extensions (aka R source code packages). This is because R requires that you also build documentation through a process that is … Continue reading →

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Rcpp 0.9.6

July 27, 2011
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A new maintenance release version 0.9.6 of Rcpp went onto CRAN and into Debian earlier today. This release contains a fix which helps the RppEigen package (mentioned previously on this blog), as well as an addition which permits user-defined fina...

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A slice of infinity

July 27, 2011
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A slice of infinity

Peng Yu sent me an email about the conditions for convergence of a Gibbs sampler: The following statement mentions convergence. But I’m not familiar what the regularity condition is. “But it is necessary to have a finite probability of moving away from the current state at all times in order to satisfy the regularity conditions on which

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How big block trades affect stock market prices?

July 27, 2011
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How big block trades affect stock market prices?

I will be giving a presentation on “Optimal transaction cost” in Vilnius on  16  August. While preparing the presentation and looking for an optimal execution solution, a natural question arises: does the size of the trade affect stock market price? I’m sure, you would say 100 % yes. Well, you would be right, but what is

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