IEEE — the world's largest professional association for the language of technology — recently published its ranking of the popularity of programming languages. The R language comes in at number 9 in the list. The ranking is based on 12 weighted factors, including Google search rankings and trends, social media chatter, aggregator posts (Reddit and Hacker news), social programming...
Item Response Theory and Item Information Exploration
In the following post I will map out some item information functions for item response theory (IRT) models using the common 3 parameter logistic model for binary responses. The...
R 3.1.1 is released (and how to quickly update it on Windows OS)
R 3.1.1 (codename “Sock it to Me“) was released today! You can get the latest binaries version from here. (or the .tar.gz source code from here). The full list of new features and bug...
R 3.1.1 is released
As announced by Peter Dalgaard for the R Core Team today, R 3.1.1 has been released. Codenamed "Sock it to Me", this is a patch release for R 3.1,...
Mathematical functions on non-numbers?!
A question came up about regarding Q1.4.9 in Cherney, Denton, Waldron. Here is a snippet of the original question: Consider …Continue reading →
How Much Can We Learn from Top Rankings using Nonnegative Matrix Factorization?
Purchases are choices from available alternatives. Post-purchase, we know what is the most preferred, but all the other options score the same. Regardless of differences in appeal, all the...
Syrian Refugee Density in Lebanon
I've done a few posts on Syria and have used data provided by the UNHCR for different analysis or visualization. There are several links on their Syrian refugee data portal that...
Tips & Tricks 4: Reading In Data Files
Today's exercise is another nice and simple one, and allows you to get used to manipulating datasets in R.Exercise 4 - How to read a file of coordinate data...
Reflections on John Chambers’ UserR! 2014 Keynote Address
by Joseph Rickert John Chambers opened UseR! 2014 by describing how the R language grew out of early efforts to give statisticians easier access to high quality statistical software....
Including GitHub and Bioconductor on Rdocumentation: Technical Details
In our last blog post we announced the addition of GitHub and Bioconductor R packages to Rdocumentation. For the more technical amongst you, I’ll give a short, high-level description...
In case you missed it: June 2014 Roundup
In case you missed them, here are some articles from June of particular interest to R users: The useR! 2014 conference in Los Angeles opened with 16 tutorials. DataInformed...
FRAMA Part IV: Continuing the Long/Short Filter Search
This post examines an n-day median filter for two desirable properties: robustness to outliers and an inherent trend-confirming lag. While … Continue reading →
Buster – a new R package for bagging hierarchical clustering
I recently found myself a bit stuck. I needed to cluster some data. The distances between the data points were not representable in Euclidean space so I had to...
Recording of OpenCPU talk at #useR2014
A recording of the useR! 2014 prentation about OpenCPU is now available on Youtube. This talk gives a brief (20 minute) motivation and...
Can Rcpp fuse ?
One of the features of Rcpp11 people seemed to like during useR is the fuse function. fuse is somewhat similar to the c function in R. For the purpose...
Are Consumer Preferences Deep or Shallow?
John Hauser, because no one questions his expertise, is an excellent spokesperson for the viewpoint that consumer preferences are real, as presented in his article "Self-Reflection and Articulated Consumer...
Speed Tests for Rolling/Running Functions
I use rolling and running functions almost daily with financial time series. In my post A Whole New World with Chains and Pipes, I made this statement I have...
R Day at Strata NYC
RStudio will teach the new essentials for doing data science in R at this year’s Strata NYC conference, Oct 15 2014. R Day at Strata is a full day...
DSC 2014, Day 2
This will be somewhat shorter summary of the second day of DSC 2014. There was a wider variety of presentations today, but I am only going to discuss those...
Dependencies of popular R packages
With the growing popularity of R, there is an associated increase in the popularity of online forums to ask questions. One of the most popular sites is StackOverflow, where...
meteoForecast, a package to obtain NWP-WRF forecasts in R
The Weather Research and Forecasting (WRF) Model is a numerical weather prediction (NWP) system. NWP refers to the simulation and …Sigue leyendo →
googleVis 0.5.3 released
Recently we released googleVis 0.5.3 on CRAN. The package provides an interface between R and Google Charts, allowing you to create interactive web charts from R.Screen shot of some...
analyze the demographic and health surveys (dhs) with r
professors of public health 101 probably cite the results of the demographic and health surveys (dhs) more than all other data sources combined. funded by the united states agency...
Reflections on useR! 2014
UseR! 2014, the R user conference held last week in LA, was the most successful yet. Around 700 R users from around the world converged on the UCLA campus...
Chillin’ at UseR! 2014
This year’s UseR! conference was held at the University of California in Los Angeles. Despite the great weather and a nearby beach, most of the conference was spent...
Sometimes Table is not the Answer – a Faster 2×2 Table
The table command is great in its simplicity for cross tabulations. I have run into some settings where it is slow and I wanted to demonstrate one simple example...
What are the names of the school principals in Mexico?, If your name is Maria, probably this post will interest you. Trends and cool plots from the national education census of Mexico in 2013
I will start this post with a disclaimer:The main intention of the post is to show how is the distribution of the school principal names in Mexico, for example,...
DSC 2014. Day 1
This is a report of the first day of the Directions in Statistical Computing (DSC) conference that took place in Brixen, Italy (See here for an introduction). Performance enhancements...
Plotly: collaborative, publication-quality graphing.
