1978 search results for "ggplot"

Plotting git statistics

July 13, 2011
By
Plotting git statistics

Here’s a funny story – friend of my, avid gamer at that time, was going downhill on a bicycle when wonderful idea flashed his mind: I need to save the current status… Just in case if I crash, I will start again from the top of the hill. If you are a developer (quantitative or

Read more »

R at Wikimedia

July 9, 2011
By

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 world. 24 schools inside the…

Read more »

Scary Derivatives and Scary XML in R

July 7, 2011
By
Scary Derivatives and Scary XML in R

I need some new R skills, and there is no better motivation to learn XML in R than one of the scariest financial datasets out there—the US Department of the Treasury Office of the Comptroller of the Currency (OCC) Quarterly Derivatives Report. I’ll...

Read more »

Things I would tell a budding bioinformatician to learn.

July 7, 2011
By

I recently read Ewan Birney's blog post, which I found echoed a lot of my own thoughts about the use of statistical in computational biology. I thought I would compile my own similar list but for bioinformatics  / computational biology in general. I have not been and in the field as long as Ewan and I certainly still...

Read more »

Artificial intelligence in trading: k-means clustering

July 6, 2011
By
Artificial intelligence in trading: k-means clustering

There is many flavors of artificial intelligence (AI), however I want to show practical example of the cluster analysis. It is very applicable in finance. For example, one of stylized facts of volatility is, that it moves in clusters, meaning that today’s volatility will be more likely as yesterday’s volatility. To gauge these moves you

Read more »

slides from my R tutorial on Twitter text mining #rstats

July 4, 2011
By
slides from my R tutorial on Twitter text mining #rstats

Update: An expanded version of this tutorial will appear in the new Elsevier book Practical Text Mining and Statistical Analysis for Non-structured Text Data Applications by Gary Miner et. al which is now available for pre-order from Amazon. In conjunction with the book, I have cleaned up the tutorial code and published it on github.

Read more »

The R apply function – a tutorial with examples

July 2, 2011
By

Today I had one of those special moments that is uniquely associated with R. One of my colleagues was trying to solve what I term an 'Excel problem'. That is, one where the problem magically disappears once a programming language is employed. Put simpl...

Read more »

Beating Kenneth French Small – High

June 30, 2011
By
Beating Kenneth French Small – High

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...

Read more »

Kenneth French Gift to the Finance World

June 29, 2011
By
Kenneth French Gift to the Finance World

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...

Read more »

Visualizing Periodic Data

June 28, 2011
By

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 the data set. Allison Chaney pointed

Read more »