Monthly Archives: May 2012

Jackknifing portfolio decision returns

May 28, 2012
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Jackknifing portfolio decision returns

A look at return variability for portfolio changes. The problem Suppose we make some change to our portfolio.  At a later date we can see if that change was good or bad for the portfolio return.  Say, for instance, that it helped by 16 basis points.  How do we properly account for variability in that … Continue reading...

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ABC+EL=no D(ata)

May 27, 2012
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ABC+EL=no D(ata)

It took us a loooong while but we finally ended up completing a paper on ABC using empirical likelihood (EL) that was started by me listening to Brunero Liseo’s tutorial in O’Bayes-2011 in Shanghai… Brunero mentioned empirical likelihood as a semi-parametric technique w/o much Bayesian connections and this got me thinking

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The aesthetics of error bars

May 27, 2012
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The aesthetics of error bars

This blog and my other main blog (the companion blog for my book) are now syndicated via R-bloggers (posts tagged R only) and statsblogs.com. The latter is a relatively new blog aggregator but looks to have some interesting content. R-bloggers it quite...

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Ben Schmid took ship’s log data (previously visualized in…

May 27, 2012
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Ben Schmid took ship’s log data (previously visualized in…

Ben Schmid took ship’s log data (previously visualized in static form on the the Spatial Analysis blog), and used ggplot and ffmpeg to animate the paths of individual voyages from 1750-1850. The images above come from the animation that combines all ...

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Project Euler — problem 3

May 27, 2012
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The third problem: The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ? My solvement is straightforward: firstly to identify all the prime numbers between 2 and sqrt(n); secondly … Continue reading →

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Tweets Analysis about Himpuan Jutaan Belia PutraJaya (Malaysia Youth Day 2012)

May 27, 2012
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Tweets Analysis about Himpuan Jutaan Belia PutraJaya (Malaysia Youth Day 2012)

I’m using the Twitter Listening Robot to know what people is talking Najib Razak, Malaysia Prime Minister. Apparently,  23-27 are the Malaysia Youth Day 2012.  There were many funny retweets (more than 50 times) by the public: RT @Faizrawrr: Be...

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Updating to R 2.15, warnings in R and an updated function list for Serious Stats

May 27, 2012
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Updating to R 2.15, warnings in R and an updated function list for Serious Stats

Whilst writing the book  the latest version of R changed several times. Although I started on an earlier version, the bulk of the book was written with 2.11 and it was finished under R 2.12. The final version of the R scripts were therefore run and checked using R 2.12 and, in the main, the most recent

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PLoS computational biology meets wikipedia

May 26, 2012
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PLoS computational biology meets wikipedia

Robin Ryder pointed out to me this new experiment run by PLoS since March 2012, namely the introduction of a new article type, “called “Topic Pages” and written in the style of a Wikipedia article“. Not only this terrific idea gives more credence to Wikipedia biology pages, at least in their early stage, but also

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Cross-valitation variability example, part I

May 26, 2012
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Cross-valitation variability example, part I

Recently I had a discussion with a student about variability of results obtained from cross-validation procedure. While the subject is well known there are not many examples on the web showing it, so I have written its simple presentation.Results from ...

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Automating repetitive plot elements

May 26, 2012
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Automating repetitive plot elements

The syntax of ggplot2 emphasizes constructing plots by adding components, or layers, using +. Possibly one of the most useful, but least remarked upon, consequences of this syntax is that it allows for an incredible degree of flexibility in saving and...

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