Articles by Adam.Hyland

R at Wikimania

August 8, 2011 | Adam.Hyland

Wikimania 2011 came to a close yesterday. For those of you unfamiliar with Wikimania it may be described as UseR for Wikipedia, Wikimedia and MediaWiki all rolled into one. The conference brings together staff, volunteer editors, volunteer developers and users of MediaWiki projects. Of specific interest to R Bloggers readers may ... [Read more...]

R at Wikimedia

July 9, 2011 | Adam.Hyland

Last year Wikipedia rolled out a pilot program to use Wikipedia article creation as an assignment in the classroom. Students wrote articles on a topic area and rather than turning them into a professor and forgetting about it they upload it to Wikipedia and expose it to readers around the ... [Read more...]

Wikipedia for Kaggle Participants

July 1, 2011 | Adam.Hyland

Kaggle has released a new data-mining challenge: use data from 10 years of Wikipedia edits in order to predict future edit rates. The dataset has been anonymized in order to obscure editor identity and article identity, simultaneously adding focus to the challenge and robbing the dataset of considerable richness. I have ... [Read more...]

No, steal *this* blog!

June 23, 2011 | Adam.Hyland

Should the world of R Wikibooks require a precis on truncated distributions, marijuana prices, or an obtusely coded method to visualize orthogonal least squares (spoiler alert: dot products are easier!), I’m your man! I hereby release all of the content and code in the R stuff category under the ... [Read more...]

Resources for Learning R (from books to blogs)

May 17, 2011 | Adam.Hyland

The information below will be periodically updated at the folowing permanent link: Searching for information on R sucks. Not only is the language name a letter of the alphabet (an ignominy it shares with C and some less well known languages), there is Pearson’s ... [Read more...]

Measuring Price Dispersion of Marijuana

April 12, 2011 | Adam.Hyland

The intersection of mapping APIs, fast database operations and user engagement offers a lot of very cool crowdsourcing applications ranging from the benign and powerful (Google’s Person Finder) to the minor and questionable (A DUI checkpoints app). Most intriguing in … Continue reading → [Read more...]

A Simple Instrumental Variables Problem

March 29, 2011 | Adam.Hyland

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 → [Read more...]

Radiation levels at Fukushima

March 24, 2011 | Adam.Hyland

From BWR The above graph is derived from data scraped from TEPCO press releases. Every hour or so for the first few days of the crisis, a TEPCO van would record radiation (probably Beta/Gamma, but the translation is unclear) at … Continue reading →
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No simulation is complete without a gif

March 24, 2011 | Adam.Hyland

I promise this is my last post on the now week and a half old π pay! Building on the last post, I figured I could show how convergence actually works in the estimation algorithm. If you’ll recall, we plotted … Continue reading → [Read more...]

More pi plus 1 (or plus 0.01) day fun

March 15, 2011 | Adam.Hyland

Since I just didn’t get enough this morning, I spent some more time fooling around with estimating pi. Since I was basically counting the number of random x,y pairs inside a quarter circle and computing a sample average for more … Continue reading → [Read more...]

I’m late for π day

March 15, 2011 | Adam.Hyland

It is officially no longer pi day, but I didn’t see this Drew Conway post about estimating pi until just a few minutes ago. Because Google Reader doesn’t show github embeds, I also got to try it without seeing Drew’s … Continue reading → [Read more...]

A Short Return to the Age-Earnings Profile

March 8, 2011 | Adam.Hyland

Two posts ago I mentioned the age-earnings profile but did not provide a regression of log earnings on wage. I also offered, without evidence, that fitting a simple linear regression would be inappropriate. How do I know that? How could … Continue reading → [Read more...]

Our Friend the Age-Earnings Profile

March 7, 2011 | Adam.Hyland

I like Labor Economics. Partially because it has a nice mix of theory and practical empiricism, but mostly because it seems to be a sub-field with a number of agreed upon stylized facts that grow not out of micro theory … Continue reading → [Read more...]

Bootstrapping the Truncated Normal Distribution

March 2, 2011 | Adam.Hyland

Here’s a post generated from my own ignorance of statistics (as opposed to just being marred by it)! In Labor Economics we walked through something called the truncated normal distribution. Truncated distributions come up a lot in the sciences because … Continue reading → [Read more...]


February 9, 2011 | Adam.Hyland

In time series work you often run into difficulties in modeling processes where the overall level of one variable (an input, for example) changes over time but the levels of another variable (an output) do not change. For instance if … Continue reading →
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Null Confusion

January 25, 2011 | Adam.Hyland

Talking a bit with my friend Jarrod about math stats and econometrics, we both came to the conclusion that the standard presentation for basic inference is lacking. In an intro or intermediate applied statistics course you learn about first and … Continue reading →
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