August 2011

display time series data in R

August 19, 2011 | Xianjun

Thanks to the Revolutions blog, several things learned here:1. R code for heat calendar2. generate SVG from R3. pretty-R toolOK. Let's explain it by plotting the fund WASCX (IVY ASSET STRATEGY FUND CLASS C) from 2009-03-14:# source code of calendarHeat... [Read more...]

Friday quote: the handmaiden and the whore

August 19, 2011 | Allan Engelhardt

Because it is Friday and because we collect quotes: If mathematics is the handmaiden of science, statistics is the whore: all that scientists are looking for is a quick fix without the encumbrance of a meaningful relationship. Statisticians are second-class mathematicians, third-rate scientists and fourth-rate thinkers. They are the hyenas, ... [Read more...]

useR! 2011 roundup

August 19, 2011 | David Smith

As I stand[*] here at Heathrow waiting for my flight back to the States, I thought I'd dash off a few quick reflections of the userR! 2011 conference at University Warwick. It was an outstanding event. There's something about a conference of just a few hundred attendees (there were about 450) that ... [Read more...]

Development of R (useR! 2011)

August 19, 2011 | csgillespie

Michael Rutter – R for Ubuntu Ubuntu 10.10 uses 2.10.1. Backports are newer versions of software for old releases. R backports are available CRAN (link). Lauchpad is a website for users to develop and maintain software (Canonical). One of Launchpad’s services is the personal package archive (PPA). This allows users to upload .... [Read more...]

useR2011 highlights

August 18, 2011 | richierocks

useR has been exhilarating and exhausting. Now it’s finished, I wanted to share my highlights. 10. My inner twelve year old schoolgirl swooning and fainting with excitement every time I chatted with a member of R-core. 9. Patrick Burns declaring that his company consists of himself and his two cats. And ... [Read more...]

Do older SOers use fewer words?

August 18, 2011 | ellbur

On StackOverflow, to posters with more experience ask their questions in fewer words? No. There's no visible difference: Chars of non-code: Chars of code: The data comes from the super-handy StackOverflow API, which was retrieved using wget and then parsed using rjson and XML. First read in and parse the ... [Read more...]

Halstead’s metrics and flat-Earthers are still with us

August 18, 2011 | Derek-Jones

I recently discovered a fascinating series of technical reports from the 1970s in the Purdue University e-Pubs archive that shine a surprising light on what are now known as the Halstead metrics. The first surprises came from Halstead’s A Software Physics Analysis of Akiyama’s Debugging Data; surprising in ... [Read more...]

I, Rbot: Tweeting from R

August 18, 2011 | John Baumgartner

Over the past few weeks I’ve been running batches of JAGS simulations from R. Although these models typically converged within an hour or so, more complex models can take days, or even weeks to converge. Because we, as humans, are … Continue reading → [Read more...]

HPC news from the useR2011 conference

August 18, 2011 | Markus (cloudnumbers.com)

It was an exciting useR2011 conference at the University of Warwick, Coventry, UK. Thanks a lot to the local organizing and program committee for having this great conference. I enjoyed the variety of talks, the poster session and the conference dinner and everything within walking distance. In view of HPC ... [Read more...]

Get Used To It

August 18, 2011 | Milk Trader

This is a brain teaser. You've been warned.The S&P 500 is in a bear market (defined as the 50-day MA being below the 200-day MA) 30.8% of the time. Also, the S&P 500 has experienced single-day 4% declines 0.242% of the time. Of the times we exp...
[Read more...]

Simon Urbanek – R Graphics: supercharged

August 18, 2011 | csgillespie

New features: rasterImage() (R2.11) bitmap raster drawing; have maps as data backdrops. Polygons with holes: polypath() -(R2.12) At present there is no way to tell when to actually show the plot. For example: plot(x); lines(x). Should we display the plot after plot or after lines Solution dev.... [Read more...]

Installing RStudio Server on Scientific Linux 6: My bash notebook

August 18, 2011 | Jeremy Leipzig

Granted, not a brilliant sysadmin mind at work here, but this might help someone someday.Scientific Linux (SL) is built from Red Hat Enterprise LinuxSee installation instructions here:http://rstudio.org/download/server[leipzig@localhost ~]$ sudo rpm -Uvhhttp://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-5.noarch.rpm[sudo] password ... [Read more...]

Kaleidoscope IIIb (useR! 2011)

August 18, 2011 | csgillespie

O. Mersmann - The microbenchmark package Slides and code (link). SURGEON GENERAL’s WARNING: Microbenchmarks can lead to a distorted view of reality and massive loss of productivity For a higher-order benchmarking package check out the rbenchmark package on R (suggestion from the speaker). Why do we need micro-benchmarking? A ... [Read more...]

Big data (useR! 2011)

August 18, 2011 | csgillespie

Unfortunatley, I missed the first and last talks. My notes from a session on Thursday morning J. Demmler – Challenges of working with a large database of routinely collected health data The SAIL data bank holds over 1.9 billion (anonymous) entries. To use the data for research, they need to ensure that ... [Read more...]

The stupidest R code ever

August 17, 2011 | Karl Broman

Let’s start this blog off right, with the stupidest R mistake I’ve ever made (I think). In the R package that I write, R/qtl, one of the main file formats is a comma-delimited file, where the blank cells in the second row are important, as they distinguish ... [Read more...]

Real Squeeze

August 17, 2011 | klr

Real yields even out to 10 years have now been competely squeezed. Either bond investors need to accept even worse negative real yields or deflation needs to get ugly for additional price returns from here. If deflation is the outcome, then shorts in s...
[Read more...]
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