May 2010

How many tanks? MC testing the GTP

May 25, 2010 | Matt Asher

It’s 1943 and you work for the good guys. A handful of German tanks have been captured, and each one has a serial number. This is back when serial numbers were still presumed to come in serial, one right after the other. Given your collection of numbered tanks, and assuming ... [Read more...]

Chicago R Meetup: Healthier than Drinking Alone

May 24, 2010 | JD Long

I’m kinda blown away by the number of folks who have joined the Chicago R User Group (RUG) in the last few weeks. As of this morning we have 65 people signed up for the group and 25 who have said that they are planning on attending the meetup this Thursday (...
[Read more...]

Webinar: R analytics and Business Intelligence dashboards

May 24, 2010 | David Smith

On Wednesday next week, Revolution will be hosting a joint webinar with open-source Business Intelligence software maker Jaspersoft and open-source Business Intelligence services company OpenBI. Together, we'll be talking about making BI dashboards even more powerful by integrating custom visualizations and advanced predictive models from R. If you create advanced ... [Read more...]

Rmetrics AMPL Interface

May 24, 2010 | rmetrics

[This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your [Read more...]

THETA AG uses Rmetrics

May 24, 2010 | rmetrics

[This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your [Read more...]

Introduction to using R with org-babel, Part 1

May 23, 2010 | erik

This post originally appeared on my Wordpress blog on May 23, 2010. I present it here in its original form. In my opinion, the description of orgmode by its creator as a tool "for keeping notes, maintaining ToDo lists, doing project planning,... [Read more...]

R Function of the Day: sample

May 23, 2010 | erik

This post originally appeared on my Wordpress blog on May 23, 2010. I present it here in its original form. The R Function of the Day series will focus on describing in plain language how certain R functions work, focusing on simple example... [Read more...]

Code and brief instruction for graphing Twitter with R

May 23, 2010 | cornelius

Edit: I’ve posted an updated version of the script here. It is not quite as compressed as Anatol’s version, but I think it’s a decent compromise between readability and efficiency. Edit #2 And yet another update, this one contributed by Kai Heinrich. I hacked together some code for ... [Read more...]

S4 timeDate Package

May 23, 2010 | rmetrics

[This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your [Read more...]

Portfolio Risk Surfaces

May 23, 2010 | rmetrics

[This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your [Read more...]

Stability Watch Views

May 22, 2010 | rmetrics

[This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your [Read more...]

Variable selection using automatic methods

May 22, 2010 | Ralph

When we have a set of data with a small number of variables we can easily use a manual approach to identifying a good set of variables and the form they take in our statistical model. In other situations we may have a large number of potentially important variables and ... [Read more...]

Using R for Introductory Statistics, 3.1

May 21, 2010 | Chris

Pairs of categorical data The grades data.frame holds two columns of letter grades, giving pairs of categorical data, like so: prev grade 1 B+ B+ 2 A- A- 3 B+ A- ... 122 B B This type of data can be summarized by the tab...
[Read more...]

The only thing smiling today is Volatility

May 21, 2010 | Lee

With the stock market freaking out and all, I figured I should take a look at how volatility was being priced in the option market. The CBOE generously provides snapshots of market data for anyone interested to download. By using this data, we can calculate the markets ‘implied volatility’, or ...
[Read more...]

Because it’s Friday: Ash

May 21, 2010 | David Smith

I lived for 10 years within sight (on a clear day, anyway) of Mount St. Helens, and had seen and heard a lot about the devastation caused by the eruption and pyroclastic flow 30 years ago. But I'd heard relatively little about the effects of the ash cloud settling on land. I ... [Read more...]

Color choosing in R made easy

May 21, 2010 | Aviad Klein

I don’t know about you, but when I want to make a graph in R, I handpick the colors, line widths etc… to produce awesome output. A lot of my time is spent on color choosing, I had to find a more convenient way of doing so. Earl F. ... [Read more...]
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