Monthly Archives: March 2011

New R User Groups in Tallahasse (FL), Hobart (TAS)

March 30, 2011
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Two new R User Groups have just started up. The first us in Tallahassee, Florida, and their first meeting is on April 10. Spinning to the other side of the globe, the other is in Hobart, the capital of the Australian island state, Tasmania (their first meeting is also on April 8). It's great to see R user groups...

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Globally Set Digits in Sweave

March 30, 2011
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Globally Set Digits in Sweave

I use Sweave regularly for most of my writing and love the way it works. However, one issue that often irks me is the inability to globally set the number of digits to display. Here is a minimal example that illustrates my point. If we now display the numbers using Sexpr, this is what we

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Rcpp workshop in Chicago on April 28th

March 30, 2011
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Overview This year's R/Finance conference will be preceded by a full-day masterclass on Rcpp and related topics which will be held on Thursday, April 28, 2011, the Univ. of Illinois at Chicago campus. Join Dirk Eddelbuettel and Romain Fr...

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Tor anonymity network using R for website graphics.

March 29, 2011
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Tor anonymity network using R for website graphics.

These graphics look familiar. From the Tor Metrics Portal: "The metrics website uses R to generate custom graphs on demand." See more here: http://metrics.torproject.org/graphs.html.

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Violins of Volatility

March 29, 2011
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Violins of Volatility

A violin plot is a combination box plot and a kernel density plot: it starts with a box plot, and adds a rotated kernel density plot to each side of the box plot. You can create violin plots with the vioplot function (from the vioplot package) package in R. When looking at the volatility of financial instruments, the financial...

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A Simple Instrumental Variables Problem

March 29, 2011
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A Simple Instrumental Variables Problem

When working with labor economics, we often run into issues with selection on variables of interest. Regressing earnings on years of education to estimate the human capital earnings function makes sense at first blush until we imagine that education is … Continue reading →

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Le Monde puzzle [#8]

March 29, 2011
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Le Monde puzzle [#8]

Another mathematical puzzle from Le Monde that relates to a broken calculator (skipping the useless tale): Given a pair of arbitrary positive integers (x,y) a calculator can either substract the same integer from both x and y or multiply either x or y by 2. Is it always possible to obtain equal

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How to Bootstrap in R: The Case of R-squared

March 29, 2011
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How to Bootstrap in R: The Case of R-squared

I recorded a new video tutorial whose original intent was to demonstrate how to write a for loop. As I wanted to make the for loop count for something, I decided that my application would be to write some code that computes the bootstrap approximation ...

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The Leverage Space Trading Model

March 29, 2011
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The Leverage Space Trading Model

I finally got around to reading Ralph Vince’s latest The Leverage Space Trading Model (for a brief summary see this magazine article in Futures), and I’m happy to say that the book was very helpful in approach and example.  I especially enjoye...

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Prune GWAS data in R

March 29, 2011
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Prune GWAS data in R

Hansong Wang, our biostats professor here at the Hawaii Cancer Center, generously gave me some R code that goes through a SNP annotation file (i.e. a mapfile) and selects SNPs that are at least a certain specified distance apart. You might want to do t...

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