February 2015

On making a Bayesian omelet

February 7, 2015 | Richard Morey

My colleagues Eric-Jan Wagenmakers and Jeff Rouder and I have a new manuscript in which we respond to Hoijtink, van Kooten, and Hulsker's in press manuscript Why Bayesian Psychologists Should Change the Way they Use the Bayes Factor. They suggest a method for "calibrating" Bayes factor using error rates. We ... [Read more...]

Inequalities and Quantile Regression

February 6, 2015 | arthur charpentier

In the course on inequality measure, we've seen how to compute various (standard) inequality indices, based on some sample of incomes (that can be binned, in various categories). On Thursday, we discussed the fact that incomes can be related to different variables (e.g. experience), and that comparing income inequalities ... [Read more...]

A Machine Learning Result

February 5, 2015 | Joseph Rickert

by Joseph Rickert Learning to effectively use any of the dozens of popular machine learning algorithms requires mastering many details and dealing with all kinds of practical issues. With all of this to consider, it might not be apparent to a person coming to machine learning from a background other ... [Read more...]

Simulating movement on a grid in R

February 4, 2015 | Andy South

In this post I outline a way of simulating movement on a grid in R in a time efficient way. This is part of a simulation of tsetse fly populations I’ve been developing. Earlier posts outline some of the background and use of arrays as the main data structure. ... [Read more...]

A Step to the Right in R Assignments

February 4, 2015 | hrbrmstr

I received an out-of-band question on the use of %% in my CDC FluView post, and took the opportunity to address it in a broader, public fashion. Anyone using R knows that the two most common methods of assignment are the venerable (and sensible) left arrow [Read more...]

Quickcheck: Randomized unit testing for R

February 4, 2015 | David Smith

Hadley Wickham's testthat package has been a boon for R package authors, making it easy to write tests to verify that your code is working directly, and alerting you when you make changes to your code that inadvertently breaks things. For the RHadoop project, though, developer Antonio Piccolboni needed a ... [Read more...]

Many package updates on CRAN

February 4, 2015 | richierocks

Over the last week or two I’ve been pushing all my packages to CRAN. pathological (for working with file paths), runittotestthat (for converting RUnit tests to testthat tests), and rebus (formerly regex, for building regular expressions in a human readable way) all make their CRAN debuts. assertive, for run-time ... [Read more...]

Predicting the six nations

February 4, 2015 | Mango Solutions

By Douglas Ashton – Consultant, UK I don’t know a lot about rugby, which can be a problem living in a rugby town. Especially when the office sweep stake on the upcoming Wales vs England six nations game goes round: … Continue reading → [Read more...]

Visualizing Home Ownership With Small Multiples And R

February 4, 2015 | aschinchon

If everybody had an ocean, across the U.S.A., then everybody’d be surfin’ like California (Beach Boys, Surfin’ U.S.A.) I was invited to write a post for Domino Data Lab, a company based in California which provides a cloud-based machine learning platform which enables companies to ...
[Read more...]

Financial Charts | Pan and Zoom

February 3, 2015 | klr

The htmlwidget for Week 2 over at Building Widgets claims to add pan and zoom interactivity to almost all R charts.  Since their were no tests on financial charts, I thought I would try it out on a couple.  It really does work.  Here is an example ... [Read more...]
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