December 2010

Academic Jargon: Field-Specific Insults

December 12, 2010 | John Myles White

Every academic field seems to develop a set of generic insults based on their intellectual toolkit. Here are two examples I hear often: Probabilists and Statisticians: “I think that’s an interesting case, but it’s in a set with measure zero.” Economists: “X group’s behavior is clearly rent-seeking.” ... [Read more...]

R with Vim on Mac OS X

December 12, 2010 | Jon

The built-in script editor for the Mac OS X R GUI actually isn’t bad. In fact it is much better than its Window’s counterpart. In particular, it has: Syntax highlighting Auto-completion Bracket matching Auto-indent Block code execution (with blocked command history) However, when coding in R and pretty ... [Read more...]

R Code Example for Neural Networks

December 12, 2010 | Matt Bogard

See also NEURAL NETWORKS. In this past June's issue of R journal, the 'neuralnet' package was introduced. I had recently been familiar with utilizing neural networks via the 'nnet' package (see my post on Data Mining in A Nutshell) but I find the neuralnet package more useful because it will ...
[Read more...]

White Bull, An Algorithm in R

December 11, 2010 | Milk Trader

Algorithms are curious creatures. They behave in a very predictable way. They do as they are told and do it the same way every time. What they lack in imagination, they make up in reliability. You cannot talk an algorithm into saying something it's not...
[Read more...]

socialR: Reproducible Research & Notebook integration with R

December 10, 2010 | Carl

I’ve created an R package that uses social media tools for reproducible research.  The goal of the package is this: whenever I run a code, output figures are automatically added to my figure repository (Flickr), linked to the timestamped version of the code that produced them in the code ... [Read more...]

Confidence bands with lattice and R

December 10, 2010 | Oscar Perpiñán Lamigueiro

If you use lattice with R, and you need to plot confidence limits in your graphic, then panel.smoother and panel.quantile from latticeExtra will help you with this task. These functions internally calculate the error bounds and use panel.polygon from lattice. If you need to plot your own ... [Read more...]

R at Google

December 10, 2010 | Josh Paulson

Last night, Ni Wang and Max Lin from Google gave a talk to the New York R User Group discussing how R is used inside Google. About 150 R developers attended the meeting. Ni and Max said that R is used very widely at Google and is an integral part of ... [Read more...]

LaTeX Typesetting – Document Structure

December 10, 2010 | Ralph

Following on from the initial post about creating a document using LaTeX we need to consider the structure of the document, i.e. headings and page layout. Fast Tube by Casper Document Class The document class is a template that specifies the appearance of different components of a document, e.... [Read more...]

An R interface to the Google Prediction API

December 10, 2010 | David Smith

An the New York R User Group* last night, 100 R users heard Ni Wang and Max Lin talk explain how "R is one of the important tools used by analysts and engineers at Google for analyzing data". During the talk, Lin revealed that Google plans to make "R more integrated ... [Read more...]

Interesting volatility measurement

December 10, 2010 | kafka

Long time ago I stumbled across interesting volatility measurement at quantifiableedges.blogspot.com. The idea is following: take 3-day historical volatility of S&P 500 index and divide that by 10-day historical volatility. Then mark all points which are less that 0.25 and measure the volatility of 3 following days. On average, the ... [Read more...]

Once again, chart critics and graph gurus welcome

December 10, 2010 | dan

HOW TO DISPLAY A LINE PLOT WITH COUNT INFORMATION? In a previously-mentioned paper Sharad and your DSN editor are writing up, there is the above line plot with points. The area of each point shows the count of observations. It’s done in R with ggplot2 (hooray for Hadley). We ... [Read more...]

Truly random [again]

December 9, 2010 | xi'an

“The measurement outputs contain at the 99% confidence level 42 new random bits. This is a much stronger statement than passing or not passing statistical tests, which merely indicate that no obvious non-random patterns are present.” arXiv:0911.3427 As often, I bought La Recherche in the station newsagent for the wrong reason! The ... [Read more...]

Illustrating CFAs – Graphviz

December 9, 2010 | gerhi

So after yesterdays post you probably ran this fancy new confirmatory factor analysis (CFA) – showed your friends all the cool fit stats and… nothing. As important as doing things right is being able to let others know that. For CFA the method of choice to illustrate the connections between variables ... [Read more...]

Choosing colors for your charts with RColorBrewer

December 9, 2010 | David Smith

If you're creating a bar chart in R, how do you decide what colors the bars should be? Or if you're creating an image plot, what range of images should you use? The colors you choose can not only affect the viewer's interpretation of the graphic, it can also determine ... [Read more...]

New version of solaR (0.21)

December 9, 2010 | procomun

The version 0.21 of the solaR package is now available at CRAN. This package provides a set of calculation methods of solar radiation and performance of photovoltaic systems. The package has been uploaded to CRAN under the GPL-3 license. solaR is now able to calculate from both daily and sub-daily irradiation ... [Read more...]
1 4 5 6 7 8 10

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)