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Visualizing Euro 2012: First Group Games

June 12, 2012
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Visualizing Euro 2012: First Group Games

Now that every team has played a match it will be interesting to see how this has affected the (inverse) odds of victory. Since the plot in my last post was a bit ‘busy’, I have decided to use the facet_wrap function in gglplot2 to stratify by group. Also, re-producing the ‘busy’ plot from the

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Volatility Position Sizing 2

June 11, 2012
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Volatility Position Sizing 2

I have discussed Volatility Position Sizing in the Volatility Position Sizing to improve Risk Adjusted Performance post using the Average True Range (ATR) as a measure of Volatility. Today I want show how to use historical volatility to adjust portfolio leverage. Let’s start with Buy and Hold strategy using SPY and rescale it to the

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\verbatim [beamer package]

June 11, 2012
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\verbatim [beamer package]

Once again working on my slides for the AMSI Lecture 2012 tour, it took me a while to get the following LaTeX code (about the family reunion puzzle) to work: \begin{frame} \slidetitle{A family meeting} \begin{block}{Random switch of couples} \only<1>{ \begin{itemize} \item Pick two couples at random with probabilities proportional to the

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Do you still have time to sleep ?

June 11, 2012
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Do you still have time to sleep ?

Last week, @3wen (Ewen) helped me to write nice R functions to extract tweets in R and build datasets containing a lot of information. I've tried a couple of time on my own. Once on tweet contents, but it was not convincing and once on the activit...

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Simulating Euro 2012

June 11, 2012
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Simulating Euro 2012

Why settle for just one realisation of this year’s UEFA Euro when you can let the tournament play out 10,000 times in silico? Since I already had some code lying around from my submission to the Kaggle hosted 2010 Take on the Quants challenge, I figured I’d recycle it for the Euro this year. The

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Random regression coefficients using lme4

June 11, 2012
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Random regression coefficients using lme4

What's the gain over lm()?By Ben OgorekRandom effects models have always intrigued me. They offer the flexibility of many parameters under a single unified, cohesive and parsimonious system. But with the growing size of data sets and increased ability to estimate many parameters with a high level of accuracy, will the subtleties of the random effects analysis be lost? In this...

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ggplot2: Creating a custom plot with two different geoms

June 9, 2012
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ggplot2: Creating a custom plot with two different geoms

This past week for work I had to create some plots to show the max, min, and median of a measure across the levels of a qualitative variable, and show the max and min of the same variable within a … Continue reading →

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Visualizing Euro 2012 with ggplot2

June 9, 2012
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Visualizing Euro 2012 with ggplot2

After scanning this paper by Zeileis, Leitner & Hornik, I thought it would be interesting to see how the victory odds for each team changes as Euro 2012 progresses. To do this, I am going to collect the daily inverse odds of a tournament victory offered by a popular betting site for each team. Here

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OpenCPU at useR 2012

June 8, 2012
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OpenCPU will be presented at useR 2012 in Nashville! Have a look at the abstract and the conference program. In the presentation we will introduce 3 inter-related projects which build on R: OpenCPU An open source framework for web development with R. Ohmage An open source system for large scale participatory sensing using mobile phones. ...

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\STATE [algorithmic package]

June 7, 2012
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\STATE [algorithmic package]

I fought with my LαTεX compiler this morning as it did not want to deal with my code: looking on forums for incompatibilities between beamer and algorithmic, and adding all kinds of packages, to no avail. Until I realised one \STATE was missing: (This is connected with my AMSI public lecture on simulation, obviously!) Filed

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