March 2013

Happy St Patrick’s Day

March 17, 2013 | arthur charpentier

I love Saint Patrick’s Day for, at least, two reasons. The first one is that, on March 17th, you can play out loud The Pogues, the second one is that it’s the only day in the year when I really enjoy getting a Guiness in a pub. And ... [Read more...]

caretEnsemble Classification example

March 16, 2013 | Zachary Mayer

Here's a quick demo of how to fit a binary classification model with caretEnsemble.  Please note that I haven't spent as much time debugging caretEnsemble for classification models, so there's probably more bugs than my last post.  ...
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Blend what?

March 16, 2013 | Jo-fai Chow

Why?Over the years I have learned quite a few things about machine learning but I have never thought of writing them down properly. Too often I can't figure out exactly what I did when I look at my old codes. The time is NOW!More importantly, I have fa... [Read more...]

GNU R loop speed comparison

March 16, 2013 | Bogumił Kamiński

Recently I had several discussions about using for loops in GNU R and how they compare to *apply family in terms of speed. I have not seen a direct benchmark comparing them so I decided to execute one (warning: some of the code presented today tak... [Read more...]

Scholarly metadata in R

March 16, 2013 | Recology - R

Scholarly metadata - the meta-information surrounding articles - can be super useful. Although metadata does not contain the full content of articles, it contains a lot of useful information, including title, authors, abstract, URL to the article, etc. One of the largest sources of metadata is provided via the Open ... [Read more...]

Changing Axis Values in R Plot

March 15, 2013 | Daniel

A colleague asked me for how one can change axis attributes in a basic plot. Plotting anything in R is really, really easy. It is enough typing plot(x, y). In general, plot functions are nicely pre-cooked, so hardly one needs to change anything. But if changes in the default ... [Read more...]

How Did I Miss “The Golden Dilemma”?

March 15, 2013 | klr

I am ashamed to admit that I am way behind (about 10,127 downloads) in discovering this wonderful paper: The Golden Dilemma (January 8, 2013)Erb, Claude B. and Harvey, Campbell R.Available at SSRN: http://ssrn.com/abstract=2078535 Here are the authors presenting the concept in July 2012 if you prefer slideshow format (thanks ...
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How do I make my graphs?

March 15, 2013 | andrew

Someone who wishes to remain anonymous writes: I’ve been following your blog a long time and enjoy your posts on visualization/statistical graphics matters. I don’t recall however you ever describing the details of your setup for plotting. I’m a new R user (convert from matplotlib) and ... [Read more...]

Calender Heatmap with Google Analytics Data

March 15, 2013 | Ravi Pathak

As data analytics consulting firm, we think we are fortunate that we keep finding problems to find. Recently my team mate found a glaring problem of not having any connector for R with Google. With the inspiration from Michael, Ajay O, it soon become a worth problem to solve. With ... [Read more...]

Veterinary Epidemiologic Research: GLM – Logistic Regression

March 14, 2013 | denishaine

We continue to explore the book Veterinary Epidemiologic Research and today we’ll have a look at generalized linear models (GLM), specifically the logistic regression (chapter 16). In veterinary epidemiology, often the outcome is dichotomous (yes/no), representing the presence or absence of disease or mortality. We code 1 for the presence ... [Read more...]

Data Science Education gets personal

March 14, 2013 | Joseph Rickert

by Joseph B. Rickert It is difficult to imagine that there is anyone on the planet with an internet connection and a desire to learn something new who has not at least looked into taking a massive open online course (MOOC). Last Fall, in an 11/4/12 article, the New York Time ... [Read more...]

Upcoming events

March 14, 2013 | Pat

Highlighted LondonR is soon — see the “Previously Announced” section. New Events Thirsty Quants 2013 March 21, London. Some thirsty quants will be going for a drink on the 21st of March as of 18.30 at the Lamb Tavern in Leadenhall Market. http://www.lambtavernleadenhall.com/ Rethinking the Economics of Pensions 2013 March 21 & 22 in London. … ...
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Apply-style commands in R

March 14, 2013 | Ari F.

Here's a quick table of what I think are the most useful apply-style commands in R: FunctionInputOutputBest forapplyRectangularRectangular or vectorApplying function to rows or columnslapplyAnythingListNon-trivial operations on almost any data typesap... [Read more...]

Using bigmemory with Rcpp

March 14, 2013 | Rcpp Gallery

The bigmemory package allows users to create matrices that are stored on disk, rather than in RAM. When an element is needed, it is read from the disk and cached in RAM. These objects can be much larger than native R matrices. Objects stored as such larger-than-RAM matrices are defined ...
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On ENAR, or Statistical Meetings in General

March 14, 2013 | Yihui Xie

Last year I accepted an invitation from Ben to go to ENAR 2013 -- my first ENAR. I used to go to JSM and useR!, and apparently I enjoy useR! most. The reason is not, or not only, because I'm more of a technical person. It is just hard to concentrate ... [Read more...]

qdap 0.2.1 Released

March 13, 2013 | tylerrinker

I’m very pleased to announce the release of qdap 0.2.1 This is the second installment of the qdap package available at CRAN. The qdap package automates many of the tasks associated with quantitative discourse analysis of transcripts containing discourse, including … Continue reading →
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In case you missed it: February 2013 Roundup

March 13, 2013 | David Smith

In case you missed them, here are some articles from February of particular interest to R users. How to resample from a large data set with RHadoop, and a video introduction to the RHadoop packages. A 90-second video explains: What is Revolution R Enterprise? Jeffrey Stanton has published a free ... [Read more...]

John Snow’s Cholera data in more formats

March 13, 2013 | Robin Wilson

In honour of the bicentenary of John Snow’s birth – and because I was asked to by someone via email – I have now released my digitisation of John Snow’s Cholera data in a few other formats: KML and as Google Fusion Tables. To save you reading my previous blog ... [Read more...]
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