Blog Archives

R-Chart: Year End Wrap Up

December 31, 2010
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R-Chart: Year End Wrap Up

Thanks to everyone who visited and commented here at R-Chart over the last year!  Blogging has forced me to crystallize my thoughts and I hope others have benefited a bit from these meanderings.  It it great to interact with the&nbs...

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Google AI Challenge: Scores/Rank by Language

December 8, 2010
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Google AI Challenge: Scores/Rank by Language

A quick follow up to the previous post: about the the scores in the 2010 Google AI competition relative to programming language.  The chart above makes each language visible and discrete - and the scales are the same.library(ggplot2)df<- read.c...

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Google AI Challenge: Languages Used by the Best Programmers

December 2, 2010
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Google AI Challenge: Languages Used by the Best Programmers

The Google AI Challenge recently wrapped up with a Lisp developer from Hungary as the winner.  The competition challenges contestants to create bots that push the limits of AI and game theory.  These bots compete against one another, and a complete ranking of competitors is available.  The big story today is...

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Mortgage Calculator (and Amortization Charts) with R

November 10, 2010
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Mortgage Calculator (and Amortization Charts) with R

Mortgage rates have been at historic lows recently.  The rates are posted various places online along with simple mortgage calculators.  Such calculators illustrate the payment schedule for a mortgage based upon selected terms. But with less ...

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Don’t be a Turkey

November 9, 2010
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Don’t be a Turkey

'Indeed, I am moving on: my new project is about methods on how to domesticate the unknown, exploit randomness, figure out how to live in a world we don't understand very well. While most human thought (particularly since the enlightenment) has focused us on how to turn knowledge into decisions, my new mission is to...

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iPhone App Store Acceptance Time / Download Results

November 3, 2010
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iPhone App Store Acceptance Time / Download Results

   Complaints about the iPhone App Store are not uncommon among developers.  The submission process is frustrating at best, you can expect arbitrary rejections, and Apple's policies have not always been particularly open or welcoming. &...

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Hadley on a Postage Stamp?

October 18, 2010
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Hadley on a Postage Stamp?

Yet another reason to check out the ggplot2 wiki!

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Cramer’s Stock Pick Recommendations Analyzed (Part II)

October 18, 2010
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Cramer’s Stock Pick Recommendations Analyzed (Part II)

     This is the second post (previous one here) that provides an analysis of Cramer's stock recommendations based upon the Mad Money Stock Screener as of 10/15/2010.Recommendations by SegmentAs mentioned in the previous post, ...

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2010 ggplot2 Case Study Competition Winners

October 16, 2010
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The 2010 ggplot2 Case Study Competition Winners have been announced!  Congratulations to the winners!Grand Prize: David Kahle, Rice UniversityFinalist: Michael Lavine, UMass Amherst Finalist: Claudia Beleites, TU Dresden & Uni....

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Cramer’s Stock Pick Recommendations Analyzed

October 16, 2010
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Cramer’s Stock Pick Recommendations Analyzed

Bill Alpert of Barron’s has demonstrated the use of R in financial journalism as he criticized the performance of Jim Cramer’s stock picks.  Patrick Burns was an advisor for the analysis done in the article.  R was an important tool that allowed them to do their research as indicated by Burns in his...

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