Monthly Archives: January 2011

Relationship Between SAT & College Retention

January 21, 2011
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Relationship Between SAT & College Retention

Here is a quick analysis of the relationship between SAT score and student retention. The data is from the Integrated Postsecondary Education Data System (IPEDS) and analyzed using R. This was a quick analysis and would be careful about making any strong conclusions. The source for running this analysis along with some additional graphics that

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Interesting volatility measurement, part 2

January 21, 2011
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Interesting volatility measurement, part 2

A few weeks ago I have mentioned about an interesting volatility prediction. It is based on two periods of historical volatility (standard deviation). The remaining question was – does it really works? I could not give the answer, because I didn’t have VIX futures data at that time. Later on, I was contacted by Brian

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Model for nothing – and the bootstrap for free

January 21, 2011
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Model for nothing – and the bootstrap for free

Reconstructing phylogenies is an interesting task, sadly one that often requires to navigate between a multitude of software. To add an unnecessary layer of complexity to the whole thing, most of these softwares speaks different languages, and requires the user to do endless conversions from fasta to phylip to nexus to whatever new format they

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Disable auto-update from R (Windows)

January 21, 2011
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There are two major threats to complex MCMC estimations:Wrong energy settings (hibernate after 2 hours of inactivity)Automatic Updates (install updates at 3 a.m.)I thought about the latter threat. At times, you may hand some R code to other co-workers,...

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Ultraedit to R

January 21, 2011
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My favorite text editor on Windows is Ultraedit, but it does not have a nice interface to R in the same vein as Emacs/ESS, Tinn-R, or Eclipse. (I have never used Eclipse.) Ultraedit is powerful enough to submit whole R programs...

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Stop your figures jumping about in odfWeave

January 21, 2011
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If you use odfWeave to produce figures, you will probably find they jump about when scrolling through the document – because the figures and figure frames are anchored in openoffice to the paragraph and not “as character”. ...

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How do you explain reproducible research to clients?

January 21, 2011
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Most of the statistics work I do now is reproducible research - this can offer a big advantage for clients but of course that doesn't necessarily mean they realise it ... Below is a text we have been pasting in at the bottom of the source d...

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Inconsistencies in Bayesian Models of Decision-Making

January 20, 2011
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But modeling devices that make sense for an unbiased decisionmaker may not make sense for a biased one. For example, why would individuals have priors and posteriors if they are destined to apply Bayes’ law incorrectly?1 A question I often ask myself. Wolfgang Pesendorfer : Behavioral Economics Comes of Age: A Review Essay on Advances

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Trip to Lyon

January 20, 2011
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Trip to Lyon

This was my first trip to Lyon in about… 35 years, I think, but I did not have much time to tour the city! My original plan was to go climbing with Ivan near La Meije right after the talk, but our respective knees were hurting for the past week at least (since Utah in

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Will I ever be a bayesian statistician ? (part 1)

January 20, 2011
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Will I ever be a bayesian statistician ? (part 1)

Last week, during the workshop on Statistical Methods for Meteorology and Climate Change (here), I discovered how powerful bayesian techniques could be, and that there were more and more bayesian statisticians. So, if I was to fully understand app...

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