# Blog Archives

## Simulation of an Oxford (Undergrad) Interview Question

October 31, 2013
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A friend of mine, who's an economics teacher in London, is responsible for preparing some of his students for interviews at Oxford and Cambridge. He told me that, at these schools, students have to go through a nerve-wracking experience where faculty pepper them with quiz questions meant to assess the ability to think quickly under pressure. ...

## CrossFit weights: gender matters less than you’d think

April 17, 2013
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Exploring Gaussian Mixture Models Exploring Gaussian Mixture Models This week in the Empirical Research Methods course, we've been talking a lot about measurement error. The idea of having some latent variable of interest, coupled with 'flawed' measures reminded me of a section of Cosma's course I really enjoyed, but haven't gotten a change to go back to – mixture...

## Behavioral Economics and Beer… highly correlated

March 19, 2013
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Short: I plot the frequency of wikipedia searches of “Behavioral Economics”, and “Beer” – who knew the correlation would be 0.7! Data reference:Data on any wikipedia searches (back to 2007) are available at http://glimmer.rstudio.com/pssguy/wikiSearchRates/. The website allows you to download frequency hits per day as a csv, which is what I've done here. # Behavioral Economics and Beer:#...

## Using maps and ggplot2 to visualize college hockey championships

March 13, 2013
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Short: I plot the frequency of college hockey championships by state using the maps package, and ggplot2 Note: this example is based heavily on the example provided athttp://www.dataincolour.com/2011/07/maps-with-ggplot2/ data reference:http://en.wikipedia.org/wiki/NCAA_Men%27s_Ice_Hockey_Championship Question of interestAs a good Minnesotan, I've believed for quite some time that the colder, Northern states enjoy a competitive advantage when it comes to college hockey. Does...

## ddply in action

March 7, 2013
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Top Batting Averages Over Time Top Batting Averages Over Time reference:http://www.baseball-databank.org/ ShortI'm going to use plyr and ggplot2 to look at how top batting averages have changed over time First load the data: options(width = 100)library(ggplot2) ## Warning message: package 'ggplot2' was built under R version 2.14.2 library(plyr)data(baseball)head(baseball) ## ...