# Monthly Archives: March 2013

## Interview with Boulder BI Brain Trust

March 11, 2013
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On Friday I traveled to Boulder, CO to update the Boulder BI Brain Trust on the latest news and updates from Revolution R Enterprise. While I was there, I was interviewed by BBBT president Claudia Imhoff. In a wide-ranging chat, we discussed: What's behind the Revolution Analytics momentum over the past year? How Business Intelligence relates to Data Science...

## Simulating Allele Counts in a population using R

March 11, 2013
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This post is inspired by the Week 7 lectures of the Coursera course "Introduction to Genetics and Evolution" (I highly recommend this course for anyone interested in genetics, BTW.) Professor Noor uses a Univ Washington software called AlleleA1 for try...

## Reproducible Research at ENAR

March 11, 2013
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I gave a talk at the Spring ENAR meetings this morning on some of the technical aspects of creating the book. The session was on reproducible research and the slides are here. I was dinged for not using git for version control (we used dropbox for simp...

## Lipsyncing for your life: a survival analysis of RuPaul’s Drag Race

March 11, 2013
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If you follow me on Twitter, you know that I’m a big fan of RuPaul’s Drag Race. The transformation, the glamour, the sheer eleganza extravanga is something my life needs to interrupt the monotony of grad school. I was able to catch up on nearly four seasons in a little less than a month, and I’ve been watching the… Continue reading →

## Veterinary Epidemiologic Research: Linear Regression Part 3 – Box-Cox and Matrix Representation

March 11, 2013
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$Veterinary Epidemiologic Research: Linear Regression Part 3 – Box-Cox and Matrix Representation$

In the previous post, I forgot to show an example of Box-Cox transformation when there’s a lack of normality. The Box-Cox procedure computes values of which best “normalises” the errors. value Transformed value of Y 2 1 0.5 0 -0.5 -1 -2 For example: The plot indicates a log transformation. Matrix Representation We can use

## Simulating Random Multivariate Correlated Data (Continuous Variables)

March 11, 2013
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This is a repost of an example that I posted last year but at the time I only had the PDF document (written in ).  I’m reposting it directly into WordPress and I’m including the graphs. From time-to-time a researcher needs to develop a script or an application to collect and analyze data. They may also need

## Hexadecimal literals in GNU R

March 11, 2013
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Recently I have used hexadecimal numbers in GNU R. The way they are parsed surprised me and is inconsistent with Java. As R Language Definition pdf only briefly mentions hexadecimal numbers here is what I have found.First I have checked the following c...

## FBit: GitHub repo for posts with R code for this blog

March 11, 2013
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This is a test post since I want to improve upon Jeffrey Horner’s strategy for posting R code in Tumblr. The only minor improvement I wanted to try out is hosting the images directly on the web. I mean, right now the images won’t show in RSS readers. I’m not doing anything new at all, just using the...

## Discovering Argon with the 2-Sample t-Test

I learned about Lord Rayleigh’s discovery of argon in my 2nd-year analytical chemistry class while reading “Quantitative Chemical Analysis” by Daniel Harris.  (William Ramsay was also responsible for this discovery.)  This is one of my favourite stories in chemistry; it illustrates how diligence in measurement can lead to an elegant and surprising discovery.  I find

## Is CTA trend following Dead?

March 10, 2013
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This i...