Publications by C
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 build methods to turn lac...
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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 than a dozen lines of R code, you can do a far more sophisticated analysis.Mortgage Calculation Function...
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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 that the winner (Gábor Melis) used...
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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)dfdf$V7 names(df)ggplot(data=df, aes(x=rank, y=elo_score, color=language)) + + geom_point(size=1) + + facet_wr...
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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 knowledgeable, educated and friendly folks in the R community. I make no claims to be an expert or authority on st...
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Ten News Stories of 2010 – and the Statistics that Made Them
Significance MagazineAccording to Significance Magazine (jointly published by Royal Statistical Society and the American Statistical Association) the following are the top ten stories of 2010.1. Progress in the prevention of HIV: Public health studies result in HIV treatment advancements.2. Drug regulation: restrictions and retraction...
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Word Cloud from Blog RSS
Crazy busy – no time to blog recently. Time enough for pretty pictures based upon previous words though…(thanks http://www.wordle.net). Related To leave a comment for the author, please follow the link and comment on their blog: R-Chart. R-bloggers.com offers daily e-mail updates about R news and tutorials about learning R and many o...
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Log File Analysis with R
R often comes up in discussions of heavy duty scientific and statistical analysis (and so it should). However, it is also incredibly handy for a variety of more routine developer activities. And so I give you… log file analysis with R! I was just involved in the launch of gradesquare.com (go ahead – click on the link and check it ...
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Please Learn to Read
There has been a lot of chatter during the past week on HN generated by with Jeff Atwood’s “Please don’t learn to code”. Actual posts included:Please don’t learn to code (www.codinghorror.com) Please Don’t Become Anything, Especially Not A Programmer (learncodethehardway.org)Please Learn to Code(sachagreif.com) Please ...
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Github Follower Graph with R
Graph a github user’s followers (and follower’s followers).Each programming language tends to develop its own idiomatic set of data structures. In R, data frames are often the structure of choice. JSON (a subset of Javascript) has emerged as an open standard for data interchange that has largely displaced XML for many web base...
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