June 2011

Last Time That Happened

June 30, 2011 | Milk Trader

I bought a lottery ticket yesterday. I hardly ever buy them. The last time I did I lost a dollar. Actually, every time I've bought a ticket I've lost.  Yesterday I was at the local gas station in line behind a bloke who had a comprehensive folder ...
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Beating Kenneth French Small – High

June 30, 2011 | klr

With 148 pageviews over the last 24 hours, my post Kenneth French Gift to the Finance World has been popular relative to most of my other posts.  I think the popularity is due to Kenneth French’s notoriety and the amazing outperformance of Small...
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Mapping SNPs to Genes for GWAS Enrichment Analysis

June 30, 2011 | Will

There are several tools available for conducting a post-hoc analysis of GWAS data looking for enrichment of significant SNPs using literature or pathway based resources. Examples include GRAIL, ALLIGATOR, and WebGestalt among others (see SNPath R Pac...
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R 2.13.1 scheduled for July 8

June 30, 2011 | David Smith

The R Core team announced today that the next update to R, version 2.13.1, will be released on July 8. Core team member Peter Dalgaard noted: The 2.13.0 release has been quite solid, but some people expect an x.y.1 to roll out on larger installations for the next academic year. Of course, ... [Read more...]

Cash Might be Your Tail Risk

June 30, 2011 | klr

Just like James Montier Ode to the Joy of Cash and David Merkel Got Cash?, I think cash is an extremely powerful tool.  Of the 3 ingredients (land, labor, and capital) of the economy, capital (cash) is most scarce at the end of a crisis or recessi...
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Don’t stop being a statistician once the analysis is done

June 30, 2011 | andrew

I received an email from the Royal Statistical Society asking if I wanted to submit a 400-word discussion to the article, Vignettes and health systems responsiveness in cross-country comparative analyses by Nigel Rice, Silvana Robone and Peter C. Smith. My first thought was No, I can’t do it, I ... [Read more...]

Winsorization

June 30, 2011 | Pat

Winsorization replaces extreme data values with less extreme values. But why Extreme values sometimes have a big effect on statistical operations.  That effect is not necessarily a good effect.  One approach to the problem is to change the statistical operation — this is the field of robust statistics. An alternative solution ... [Read more...]

Kenneth French Gift to the Finance World

June 29, 2011 | klr

Kenneth French gives one of the best gifts to the finance world at his website http://mba.tuck.dartmouth.edu/pages/faculty/ken.french/data_library.html.  I am surprised I have waited so long to write a post about this wonderful resource.  Aft...
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Two browsers for R help documentation

June 29, 2011 | heuristicandrew

The same excellent documentation for R commands is available through two different help browsers: text and HTML, and let’s see how how each looks, works, and how to switch the default. Look and feel Here is how both look for … Continue reading → [Read more...]

roll calls, ideal points, 112th Congress

June 29, 2011 | jackman

Now that classes are over, I took a little time to update my scripts that update the analysis of Congressional roll calls in close to real time.   Links appear at the top of the blog.   As of about 15 minutes ago, we’re up to 77 non-unanimous roll calls in the 112th ... [Read more...]

A simple ggplot2 scatterplot

June 29, 2011 | Luke Miller

Here’s a bit of code used to produce one of the figures in my recent paper dealing with modeling rocky intertidal snail body temperatures. This was my first foray into ggplot2, and it only involved a few hours of head-scratching. The plot is a co... [Read more...]

Stata 12 embraces structural equation models

June 28, 2011 | Murtaza Haider

Stata 12 has just been announced. The software will start shipping by the end of July.  A key new feature introduced in the new version is the module for structural equation models (SEM), a staple tool in marketing, psychology, and several other research disciplines.LISREL and AMOS have been the two ... [Read more...]

Synctex with Sweave/pgfSweave in TeXShop/TeXWorks

June 28, 2011 | cameron

Ever been editing an .Rnw (Sweave) file and tried to sync a pdf with the source in TeXShop (or TeXWorks) and had it open the .tex file? This is because the synctex information (in the .synctex.gz file) is messed up. Both TeXShop and TeXWorks support synctex, that means that ... [Read more...]

Benchmarking Revolution R for data mining

June 28, 2011 | David Smith

The blog Heuristically Andrew puts Revolution R through its paces by running some benchmarks versus open-source R for data mining applications. The benchmarks set out to answer the following question: I recently upgraded my notebook (where I often use R for data mining) and was faced with two questions: for ... [Read more...]

p-Values for Cointegration Tests With Breaks in the Data

June 28, 2011 | Dave Giles

In an earlier post I went through some econometrics that involved the problem of testing for multivariate cointegration in the case where there are one or more trend-breaks or level-breaks in the time-series data.  Specifically, I talked about the modified Trace tests introduced by Johansen et al. (2000), and I mentioned ... [Read more...]

Visualizing Periodic Data

June 28, 2011 | John Myles White

Yesterday the Princeton machine learning reading group went through a paper by Tukey on “Some graphic and semigraphic displays”. One issue we talked about at length was Tukey’s idiosyncratic approach to visualizing periodic data in a circular format to emphasize the connections between the “start” and the “end” of ... [Read more...]
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