## My first… web application with Shiny

December 11, 2013
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It was several time I was thinking about developing a web application with R and Shiny. In these days I realize my first application with Shiny. You can find it at http://spark.rstudio.com/nsturaro/pyramid0/ The idea is very simple: I plot a … Continue reading →

## 24 Days of R: Day 10

December 10, 2013
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How often is someone nominated for an academy award? Who has been nominated most often? Is there a difference between leading and supporting roles? Important questions. To answer them,...

## Creating custom CDF for Affy chips in R / Bioconductor

Creating custom CDF for Affy chips in R / Bioconductor What? For those who don't know, CDF files are chip definition format files that define which probes belong to which probesets,...

## In case you missed it: November 2013 Roundup

December 10, 2013
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In case you missed them, here are some articles from October of particular interest to R users: A recap of the Strata Hadoop World conference, including presentations from Monsanto...

## Feature Prioritization: Multiple Correspondence Analysis Reveals Underlying Structure

December 10, 2013
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Measuring the Power of Product Features to Generate Increased DemandProduct management requires more from feature prioritization than a rank ordering. It is simply not enough to know the "best"...

## Writing papers using R Markdown

Writing papers using R Markdown I have been watching the activity in RStudio and knitr for a while, and have even been using Rmd (R markdown) files in my...

December 10, 2013
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A new Armadillo release 3.930 came out a few days ago, with a very nice set of changes (see below). I rolled this into RcppArmadillo 0.3.930.0. However, one of...

## Next Kölner R User Meeting: 13 December 2013

December 10, 2013
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Quick reminder: The next Cologne R user group meeting is scheduled for this Friday, 13 December 2013. We are delighted to welcome: Matt Dowle and Arun Srinivasan: Introduction to

## eeptools 0.3 Released!

December 9, 2013
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Version 0.3 of my R package of miscellaneous code has been released, this time with substantial contributions from Jason Becker via GitHub. Progress continues toward the ultimate goal for eeptools to...

## 24 Days of R: Day 9

December 9, 2013
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This will be the third time I've tried to write this post. I had started out presuming that I would uncover something fascinating about applying Bayesian inference to a...

## Hive Plots using R and Cytoscape

(This article was first published on Deciphering life: One bit at a time :: R, and kindly contributed to R-bloggers) I found out about HivePlots this past summer, and...

## Matrix factorizations and social network graph analysis

December 9, 2013
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$Matrix factorizations and social network graph analysis$

This is a lecture post for my students in the CUNY MS Data Analytics program. In this series of lectures …Continue reading »

December 9, 2013
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GoalBring consistency and transparency to the analyses of publicly available Tornado datasets using an R-based open source analysis.IssuesTornado data available from the NOAA Storm Prediction Center and other government agencies...

## Intentionally Writing Obtuse Code

December 9, 2013
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Sometimes intentionally writing bad code can be a lot of fun. Now here, when I say "bad", I mean something that's functional but completely incoherent to anything but the...

## Adobe Analytics Implementation Documentation in 60 seconds

December 9, 2013
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When I was working as a digital analytics consultant, no question quite had the ability to cause belly laughs AND angst as, “Can you send me an updated copy...

## roxygen2 3.0.0

December 9, 2013
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We’re pleased to announce a new version of roxygen2. The biggest news is that you can painlessly document your S4 classes, S4 methods and RC classes with roxygen2 –...

## Introduction to Spatial Data and ggplot2

December 9, 2013
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For those starting out with spatial data in R, Robin Lo

## “Programming with R” course in Milano (Italy) on January 30-31

December 9, 2013
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Course description This two-day course provides an overview of several advanced R topics, such as: R environments, object oriented programming, functional programming and debugging. Who should attend this course...

## Storing package data in custom environments

Storing package data in custom environments If you do R package development, sometimes you want to be able to store variables specific to your package, without cluttering up the users...

## Data mountains and streams – stacked area plots in R

December 9, 2013
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Below are two functions for producing stacked area plots. The first is the more typical approach where sequential series are stacked on top of another (function: plot.stacked), while the...

## Performance of the divide-and-conquer SVD algorithm

December 9, 2013
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The ubiquitous LAPACK library provides several implementations for the singular-value decomposition (SVD). We will illustrate possible speed gains from using the divide-and-conquer method by comparing it to the...

## analyze the program for international student assessment (pisa) with r and monetdb

December 9, 2013
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the authoritative source for evaluating educational achievement across nations, the program(me) for international student assessment ranks the math, science, and reading skills of 15-year-olds in more than sixty countries. ...

## Summarize statistics by Groups in R & R Commander

December 8, 2013
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R is great at accomplishing complex tasks. Doing simple things with R though takes some effort. Consider the simple task of producing summary statistics for continuous variables over some...

## Probabilistic bug hunting

Have you ever run into a bug that, no matter how careful you are trying to reproduce it, it only happens sometimes? And then, you think you've got it, and finally...

## Down-Sampling Using Random Forests

December 8, 2013
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We discuss dealing with large class imbalances in Chapter 16. One approach is to sample the training set to coerce a more balanced class distribution. We discuss down-sampling: sample the...

## Sentence Drawing: Function vs. Art

December 8, 2013
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I recently was reading the book “Functional Art” and came across the work of Stefanie Posavec. Her Sentence Drawings (click here to see and click here to learn) caught...

## Comparing mnlogit and mlogit for discrete choice models

December 8, 2013
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Earlier this weekend (Dec. 7, 2013), mnlogit was released on CRAN by Wang Zhiyu and Asad Hasan ([email protected]) claiming that mnlogit uses “parallel C++ library to achieve fast computation of...

## Tim Hortons Density

Tim Hortons Density Inspired by this post, I wanted to examine the locations and density of Tim Hortons restaurants in Canada. Using Stats Canada data, each census tract is...