RcppArmadillo 0.2.14 and 0.2.15

March 4, 2011
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A few days ago Conrad Sanderson released version 1.1.6 of his Armadillo templated C++ library for linear algebra. Accordingly, I made a new release 0.2.14 of RcppArmadillo, our Rcpp-based integration into R which included a few local fixes. However, ...

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A Million Random Digits: review of reviews

March 4, 2011
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A Million Random Digits: review of reviews

Recently on his blog (here), Robin mentioned an amazing book, called "A Million Random Digits" published by RAND corporation. The book was initially published in 1955, but RAND published a nice (and expensive) second edition. A great thing is that ...

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Death Spiral Warning Graph

March 4, 2011
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Death Spiral Warning Graph

In the death spiral scenario, rates go up while the currency goes down.  Here is the way to watch that.  I’m not saying that death spiral of US Dollar and interest rates occurs, but without significant action to restore confidence in fiscal...

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Yet another R report generator, and more!

March 4, 2011
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Yet another R report generator, and more!

I recently uploaded some code to R-forge related to an R package I’ve been working on, titled yarr. The work was motivated by a desire to embed R code and output within my HTML blog posts! Months ago, I wrote about a potential solution to this using the brew package. yarr is a new, but

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More on logging the outcome

March 4, 2011
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More on logging the outcome

This one does my head in. I do it fairly regularly, lots of people do, but I find everytime it comes to interpreting the results I have to slow it right down and go step by step. Answer: When you log the outcome, then on the original scale, for all else constant, Y will be

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Video Introduction to R Packages by Rory Winston – Melbourne R Users February 2011

March 3, 2011
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Video Introduction to R Packages by Rory Winston – Melbourne R Users February 2011

On February 17th 2011 Rory Winston gave a talk on creating R packages at the Melbourne R Users Group (see Meetup page). Slides from the talk can be downloaded here. For more information about Rory check out his blog The … Continue reading →

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Testing Multiple Linear Restrictions in R

March 3, 2011
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Testing Multiple Linear Restrictions in R

This video shows a couple of things:1. How to test (multiple) linear restrictions in R.2. How to install a package in R. Here is the code I use in the video (with some extra comments).Here is the data set that I use in the video.

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Converting text files with sed

March 3, 2011
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Sed is my friend to change fixed-width text files (e.g., from an R screen output) to a comma delimited file using sed 's/ */,/g' file1 >file2.csv Note the two spaces between s/ and */.

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Keep an Eye on the emerging Open-Source Analytics Stack

March 3, 2011
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This post is contributed by Revolution Analytics CEO Norman Nie, and cross-posted from the Future of Open Source Forum. A lot of attention has been focused recently on Big Data, and rightly so: Big Data is a Big Deal. (See this LinuxInsider article, Big Data, Big Open Source Tools, for a compehensive overview of Big Data issues.) But what,...

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Creating R Packages

March 3, 2011
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Rory Winston provides a detailed introduction to creating R packages. He provides a simple of, from start to finish, as well as how to incorporate native code into your package.

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3D Anisotropy parameters

March 3, 2011
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Hello everyone, I’m trying to create a method for calculating the 5 parameters for the 3D anisotropy in an automatic way. Basically I created a loop for analysing the range of the horizontal variogram in every direction and extrapolating the maximum (for the angle p). Then it computes the vertical variogram in the direction of maximum...

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3D Anisotropy parameters

March 3, 2011
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Hello everyone, I’m trying to create a method for calculating the 5 parameters for the 3D anisotropy in an automatic way. Basically I created a loop for analysing the range of the horizontal variogram in every direction and extrapolating the maximum (for the angle p). Then it computes the vertical variogram in the direction of maximum...

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cut&paste typo in R book

March 2, 2011
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cut&paste typo in R book

A casualty of cut-and-paste in Chapter 3 of Introducing Monte Carlo Methods with R. Brad McNeney from Simon Fraser sent me a nice email about the end of Example 3.6 missing a marginal estimate. Indeed, it does. And it should have been obvious from the “estimates” we derived, 19 and 16, which are not even

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R Video Tutorial for Spatial Statistics

March 2, 2011
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Welcome everybody, this is a video tutorial that will try to teach you how to use R for spatial statistics and interpolation. I’m a PhD student in soil science and in particular my project is about digital soil mapping. During my work I often use R particularly for geostatstical interpolation. ...

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R Video Tutorial for Spatial Statistics

March 2, 2011
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Welcome everybody, this is a video tutorial that will try to teach you how to use R for spatial statistics and interpolation. I’m a PhD student in soil science and in particular my project is about digital soil mapping. During my work I often use R particularly for geostatstical interpolation. ...

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Investing with the Odds

March 2, 2011
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Investing with the Odds

In this previous post, I showed that a look at the correlations in the daily returns of S&P 500 should have lead to a very profitable investing strategy. I also promised to show the results of this strategy in the 80s, but I am not going to do that, because MarketSci has done so in

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Calling R from JasperReports Server

March 2, 2011
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Revolution Analytics today announced a partnership with Jaspersoft, the makers of the most widely-used business intelligence software in the world. With this partnership, Revolution R and Jaspersoft software work together to bring the power of analytics coded in R to business users working with Business Intelligence (BI) dashboards and reports. If you're a Jaspersoft or R developer and would...

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RStudio

March 2, 2011
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All the cool kids are talking about it so I should take some time to plug RStudio, a free open source IDE for R. Unlike some of the “beginner” IDEs like Deducer, RStudio is not designed to offer menu based … Continue reading →

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Rcpp at Geneva-R

March 2, 2011
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I'll present Rcpp at the inaugural Geneva-R meeting. Geneva-R is an informal gathering of R enthusiasts sponsored by Mango Solutions, that builds on the success of London-R, where I presented twice, and Basel-R

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Anova – Type I/II/III SS explained

March 2, 2011
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Anova – Type I/II/III SS explained

Not my post, just bookmarking this. It’s from http://goanna.cs.rmit.edu.au/~fscholer/anova.php ANOVA (and R) The ANOVA Controversy ANOVA is a statistical process for analysing the amount of variance that is contributed to a sample by different factors. It was initially derived by R. A. Fisher in 1925, for the case of balanced data (equal numbers of observations

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The easiest way to get UTR sequence

March 2, 2011
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I just figure out the way to query UTR sequences from ensembl by biomart tool. It is very simple compared with using bioperl to parse gbk files to extract UTR sequences. Read More: 236 Words Totally

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The easiest way to get UTR sequence

March 2, 2011
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I just figure out the way to query UTR sequence from ensembl by biomart tool. It is very simple compare with using bioperl to parse gbk file to extract UTR sequence. Read More: 232 Words Totally

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Bootstrapping the Truncated Normal Distribution

March 2, 2011
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Bootstrapping the Truncated Normal Distribution

Here’s a post generated from my own ignorance of statistics (as opposed to just being marred by it)! In Labor Economics we walked through something called the truncated normal distribution. Truncated distributions come up a lot in the sciences because … Continue reading →

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Review of R Graphs Cookbook

March 1, 2011
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The kind people at Packt Publishing recently asked me to review one of their newest R books: the R Graphs Cookbook. In general, I think pretty highly of the book: it provides a nice overview of the basic tools for visualizing data in R. If you’re just getting started with creating graphs in R, this

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Why learn R?

March 1, 2011
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Why learn R?

I'm introducing R to a few colleagues this week and want to share why learning a software like R is important... Here are a few articles that explain it well... Other reasons?Importance of data science- Couple years ago Google's Chief Economist Hal Var...

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Why learn R?

March 1, 2011
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Why learn R?

I'm introducing R to a few colleagues this week and want to share why learning a software like R is important... Here are a few articles that explain it well... Other reasons?Importance of data science- Couple years ago Google's Chief Economist Hal Var...

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MARCH 16 UPDATE: My email scraping has become surprisingly…

March 1, 2011
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MARCH 16 UPDATE: My email scraping has become surprisingly…

MARCH 16 UPDATE: My email scraping has become surprisingly controversial, so I’ve taken down the code and other plots for now. Ironically, I’ve also updated the plot. I studied the emails sent to my dorm’s email list and drew some plots. A little context should be enough for you to follow them. Risley Hall is an arts-themed dorm...

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Extracting sea surface temperatures from NOAA’s OISSTv2

March 1, 2011
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NOAA’s Physical Sciences Division produces a global map of weekly averaged sea surface temperatures, derived from satellite sources. The data can be found at http://www.esrl.noaa.gov/psd/data/gridded/data.noaa.oisst.v2.html. I’ve put togeth...

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Mapping the Chicago mayoral election

March 1, 2011
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Mapping the Chicago mayoral election

Rahm Emanuel is now Mayor of Chicago, having successfully defended a court challenge to his candidacy and then 5 rivals in the February 22 election. The Chicago Tribune has put together an interactive map of the results (color-coded by the winner in each precinct), but for R hackers who would like to create similar maps of other elections, the...

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