Mindoro Digital Elevation Map

June 14, 2012
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Mindoro Digital Elevation Map

Saw a map produced by my previous student using a commercial GIS software.Using R raster package and data from diva-gis.org. I produced the same map

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#4 R: A powerful tool for the geochemist

June 14, 2012
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#4 R: A powerful tool for the geochemist

  R is an incredibly powerful programming tool used by a large community of people who require an easy to use, light weight, FREE, and fundamentally awesome statistics package! I have recently discovered that R can be used by geologists whose IT skills are often pitied by their more computer literate geophysicist colleagues. Long story short

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Revolution Newsletter: June 2012

June 14, 2012
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The most recent edition of the Revolution Newsletter is out. The news section is below, and you can read the full June edition (with highlights from this blog and community events) online. You can subscribe to the Revolution Newsletter to get it monthly via email. Revolution R Enterprise 6 Now Available! The latest release of Revolution R Enterprise brings...

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Some interesting ggplot2 tutorials for the social sciences @ Code à la Mode

June 14, 2012
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Some interesting ggplot2 tutorials for the social sciences @ Code à la Mode

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Recent R packages for ecology and evolution

June 14, 2012
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Many R packages/tools have come out recently for doing ecology and evolution. All of the below were described in Methods in Ecology and Evolution, except for spider, which came out in Molecular Ecology Resources. Here are some highlights. mvabund pap...

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Performance with foreach, doSNOW, and snowfall

June 13, 2012
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Is it just me, or does the performance of the foreach package with a doSNOW backend operating on a socket grid suck?Here at work, I am helping to setup a cluster of Windows machines for distributed R processing.  We have lots of researchers runnin...

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Making rApache load rJava

June 13, 2012
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Here at work I've been in the business of developing webapps using R as the backend computational framework.  The list of parts to get this running is pretty lightweight, just:R Apache 2rApacheI'm not going to cover how to set these things up here...

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Rook Tutorial at useR! 2012

June 13, 2012
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Rook Tutorial at useR! 2012

I had such a blast presenting my tutorial on Rook yesterday. Thanks go out to all who attended! All the slides are online here and I’ll be updating my RookTutorial github project with all the great suggestions I got from the attendees. Also, check back soon as I’m planning more postings on Rook. Cheers!

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Body Weight in the United States – Part 2, "Non Factors"

June 13, 2012
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Body Weight in the United States – Part 2, "Non Factors"

Sometimes the story isn't what is a trend, but rather what is not a trend. In this second installment about body weight in the U.S., listing what doesn't seem to be contributing factors will help narrow down what might actually be the p...

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Estimation of hydraulic conductivity and its uncertainty from grain-size data using GLUE and artificial neural networks.

June 13, 2012
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Estimation of hydraulic conductivity and its uncertainty from grain-size data using GLUE and artificial neural networks.

AbstractVarious approaches exist to relate saturated hydraulic conductivity (Ks) to grain-size data. Most methods use a single grain-size parameter and hence omit the information encompassed by the entire grain-size distribution. This study compares two data-driven modelling methods—multiple linear regression and artificial neural networks—that use the entire grain-size distribution data as input for Ks prediction. Besides the predictive capacity of the methods,...

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Comparing continuous distributions with R

June 13, 2012
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Comparing continuous distributions with R

In R we’ll generate similar continuous distributions for two groups and give a brief overview of statistical tests and visualizations to compare the groups. Though the fake data are normally distributed, we use methods for various kinds of continuous distributions. … Continue reading →

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In case you missed it: May 2012 Roundup

June 13, 2012
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In case you missed them, here are some articles from May of particular interest to R users. R tops the annual KDNuggets Data Mining Software poll for the first time. R 2.15.1 is scheduled for June 22. (Revolution R Enterprise 6, released on June 5, is based on 2.14.2.) A tutorial uses R, Hadoop, and the RHadoop project to...

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How to order bars in bar graph (Stack Overflow FAQ)

June 13, 2012
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How to order bars in bar graph (Stack Overflow FAQ)

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Why R is Hard to Learn

June 13, 2012
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Why R is Hard to Learn

The open source R software for analytics has a reputation for being hard to learn. It certainly can be, especially for people who are already familiar with similar packages such as SAS, SPSS or Stata. Training and documentation that leverages … Continue reading →

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Data on GitHub: The easy way to make your data available

June 13, 2012
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Data on GitHub: The easy way to make your data available

GitHub is designed for collaborating on coding projects. Nonetheless, it is also a potentially great resource for researchers to make their data publicly available. Specifically you can use it to:store data in the cloud for future use (for free),track ...

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Twitter unfollowers with R and Rook

Twitter unfollowers with R and Rook

In my last blog I'm following you in Twitter...are you following me back? I show you how to use the Twitter APIs to get a list of the people that you follow but doesn't follow you back.This time, I want to extend the tool as I installed the R...

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Next R meeting in Paris INSEE: ggplot2 and parallel computing

June 12, 2012
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Next R meeting in Paris INSEE: ggplot2 and parallel computing

Hi, our group of R users from INSEE, aka FLR, meets monthly in Paris. Next meeting is on Wed 13 (tomorrow), 1-2 pm, room 539 (an ID is needed to come in,  map to access INSEE R), about ggplot2 and parallel computing. Since the first meeting in February, presentations have included hot topics like webscrapping, C in R, RStudio, SQLite

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Finding word use patterns in Wikileaks cables

June 12, 2012
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Finding word use patterns in Wikileaks cables

6/18: A follow-up to this post is now available here.Recent DiscoveriesWhen I was a diplomat, I was always interested in the Wikileaks cables and what could be done with them. Unfortunately, I never got a chance to look at the site in depth, due to security policies. Now that the ex- is firmly prepended to diplomat...

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Finding word use patterns in Wikileaks cables

June 12, 2012
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Finding word use patterns in Wikileaks cables

6/18: A follow-up to this post is now available here.Recent DiscoveriesWhen I was a diplomat, I was always interested in the Wikileaks cables and what could be done with them. Unfortunately, I never got a chance to look at the site in depth, due to security policies. Now that the ex- is firmly prepended to diplomat...

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NBA Predictions — Finals

June 12, 2012
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NBA Predictions — Finals

Now we are on to the finals! The algorithm enters the finals with a 6-4 record so far. Here is what we have for tonight: So, let's see if OKC wins this one.

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Finding Word Use Patterns in Wikileaks Cables

June 12, 2012
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Finding Word Use Patterns in Wikileaks Cables

6/18: A follow-up to this post is now available here. Recent Discoveries When I was a diplomat, I was always interested in the Wikileaks cables and what could be done with them. Unfortunately, I never got a chance to look at the site in depth, due to security policies. Now that the ex- is firmly prepended to diplomat in my...

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Twotorials

June 12, 2012
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Twotorials

http://www.twotorials.com/Heres a fun little page!About 90 two minute tutorials (twotorials, haha) on various things in R!From "what does object oriented programming mean" to calculating the number of days youve been alive.The guy has an amusing voice too!!Great for newbies to R I should imagine!!!Have a look!!

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PCA and ggplot2 to recognise gestures (via David…

June 12, 2012
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PCA and ggplot2 to recognise gestures (via David…

PCA and ggplot2 to recognise gestures (via David Chudzicki’s Blog: Visualizing ChaLearn Gestures Test Data)

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Interactive slideshows with R & Tiki (jquery.s5 powered)

June 12, 2012
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Interactive slideshows with R & Tiki (jquery.s5 powered)

Using PluginR you can produce interactive slideshows in Tiki running R code in some slides. This is possible thanks to the integrated jquery.s5 slideshow system, which was introduced already back in Tiki 7.0 and improved until its present form in Tiki...

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Density Estimation of High-Frequency Financial Data

Frequently we will want to estimate the empirical probability density function of real-world data and compare it to the theoretical density from one or more probability distributions. The following example shows the empirical and theoretical normal density for EUR/USD high-frequency … Continue reading →

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Quickly use googleVis in web reports using Tiki and PluginR

June 12, 2012
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Quickly use googleVis in web reports using Tiki and PluginR

R is hot and amazing. Tiki is too And with PluginR, we can easily place in simple or advanced web reports any R code, in a similar fashin to what can be achieved with other longer combinations (Sweave, Knitr, ... and latex). For instance, I tried a few days ago to quickly...

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NBA Predictions — Finals

June 12, 2012
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NBA Predictions — Finals

Now we are on to the finals! The algorithm enters the finals with a 6-4 record so far. Here is what we have for tonight: So, let's see if OKC wins this one.

Read more »

Finding Word Use Patterns in Wikileaks Cables

June 12, 2012
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Finding Word Use Patterns in Wikileaks Cables

6/18: A follow-up to this post is now available here.Recent DiscoveriesWhen I was a diplomat, I was always interested in the Wikileaks cables and what could be done with them. Unfortunately, I never got a chance to look at the site in depth, due to security policies. Now that the ex- is firmly prepended to diplomat in my...

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Videos from ‘Tiki + PluginR’ workshop available

June 12, 2012
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Videos from ‘Tiki + PluginR’ workshop available

The videos from 'Tiki + PluginR' workshop given in Madrid (Nov'12) in the context of the "3as Jornadas de Usuarios de R en Castellano" are available online. See it within the page of the fulll workshop: 2011. Taller 5: Crea interfaces Web 2.0 a tus programas en R con software libre (LAMP + Tiki + PluginR)....

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