What we did in our Stan meeting yesterday: Some discussion of revision of the Nuts paper, some conversations about parameterizations of categorical-data models, plans for the R interface, blah blah blah. But also, I had two exciting new ideas! Google Translate for code Wouldn’t it be great if Google Translate could work on computer languages?
Monthly Archives: May 2012
How to plot three categorical variables and one continuous variable using ggplot2
This post shows how to produce a plot involving three categorical variables and one continuous variable using ggplot2 in R. The following code is also available as a gist on github. 1. Create Data First, let's load ggplot2 and create some data to work...
An ivreg2 function for R
The ivreg2 command is one of the most popular routines in Stata. The reason for this popularity is its simplicity. A one-line ivreg2 command generates not only the instrumental variable regression coefficients and their standard errors, but also a number of other statistics of interest. I have come across a number of functions in R 
reshape (from base) Explained: Part I
This Post Will Explain the Basics of Wide to Long With base reshape (part I) Often your data set is in wide format and some sort of analysis or visualization requires putting the data set into long format. Hadely Wickham … Continue reading →
Yes, you need more than just R for Big Data Analytics
Douglas Merrill, former CIO/VP of Engineering at Google, writes in Forbes about using the R language for data analysis: Most folks with math-oriented graduate degrees will have written something in R, a non-commercial option for your big data analysis. So, great graduates from great graduate schools know great tools. His post is titled 'R Is Not Enough For "Big...
Doodling With a Conversation, or Retweet, Data Sketch Around LAK12
How can we represent conversations between a small sample of users, such as the email or SMS converstations between James Murdoch’s political lobbiest and a Government minister’s special adviser (Leveson inquiry evidence), or the pattern of retweet activity around a couple of heavily retweeted individuals using a particular hashtag? I spent a bit of time 
knitr-Example: Use World Bank Data to Generate Report for Threatened Bird Species
I'll use the below script that retrieves data for threatened bird species from the World Bank via its API and does some processing, plotting and analysis. There is a package (WDI) that allows you to access the data easily.# world bank indicators for sp...
EU rules that computer languages cannot be copyrighted
The European Court of Justice has published its decision in SAS v WPL; the title of the press release says it all “The functionality of a computer program and the programming language cannot be protected by copyright”. To summarise the background, World Programming Ltd developed a system that was capable of emulating the input/output behavior
Big Data, R and SAP HANA: Analyze 200 Million Data Points and Later Visualize in HTML5 Using D3 – Part III
Mash-up Airlines Performance Data with Historical Weather Data to Pinpoint Weather Related DelaysFor this exercise, I combined following four separate blogs that I did on BigData, R and SAP HANA. Historical airlines and weather dat...
Function to Generate a Random Data Set
Often I find myself needing data sets to try functions and code out on or for teaching purposes. I have a few stand-bys such as the mtcars and CO2 data sets in the base packages of R but sometimes I … Continue reading →
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
