Just announced: World Bank Data features and data are available. Previous posts have demonstrated how to access and plot this data using R (including the use of the R WDI package). The chart above can be created using the following pr...
Monthly Archives: September 2010
Guidelines for efficient R programming
R is designed to make it easy to clearly express statistical ideas in code, but when it come to writing code that runs as fast as possible, there are a few tips, tricks and caveats to be aware of. As part of the BioConductor conference this past summer, Martin Morgan prepared a tutorial on efficient R programming. (Patrick Abouyen...
Visualizations of US neighborhoods by race and ethnicity
HOMOPHILY + MAPS WITHOUT MAPPING SOFTWARE In the past, Decision Science News has posted about homophily (“birds of a feather shop together“) and cool, lightweight visualizations (“maps without map packages in R“). Today, both topics come together in Eric Fischer’s fascinating set of images on Flickr called “Race and Ethnicity”(*). According to Eric: Red is
Connecting to SQL Server from R using RJDBC
A few months ago I switched my laptop from Windows to Ubuntu Linux. I had been connecting to my corporate SQL Server database using RODBC on Windows so I attempted to get ODBC connectivity up and running on Ubuntu. ODBC on Ubuntu turned into an exercise in futility. I spent many hours over many days
My Crappy Fantasy Football Draft
I compared the results of my fantasy football draft with the results of more than 1500 mock drafts at the Fantasy Football Calculator (FFC). I looked at where player X was drafted in our league, subtracted off the average draft … Continue reading →
R Function of the Day: foodweb
The R Function of the Day series will focus on describing in plain language how certain R functions work, focusing on simple examples that you can apply to gain insight into your own data. Today, I will discuss the foodweb function, found in...
R Function of the Day: foodweb
The R Function of the Day series will focus on describing in plain language how certain R functions work, focusing on simple examples that you can apply to gain insight into your own data. Today, I will discuss the foodweb function, found in...
Oil – Equities correlation – trading opportunity or new normal?
The R-Files: Hadley Wickham
"The R-Files" is an occasional series from Revolution Analytics, where we profile prominent members of the R Community. Name: Hadley Wickham Profession: Assistant Professor of Statistics, Rice University Nationality: New Zealand Years Using R: 10 Known for: Developing popular R packages including ggplot2, plyr, reshape; creator of crantastic.org; author of ggplot2: Elegant Graphics for Data Analysis An Assistant Professor...
Classification Trees using the rpart function
In a previous post on classification trees we considered using the tree package to fit a classification tree to data divided into known classes. In this post we will look at the alternative function rpart that is available within the base R distribution. Fast Tube by Casper A classification tree can be fitted using the rpart function
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
