Publications by C
New World Bank Data Available
Just announced: World Bank Data features and data are available. Previous posts have demonstrated how to access and plot this data using R (including the use of the R WDI package). The chart above can be created using the following program in R.library(ggplot2)library(WDI)DF ggplot(DF, aes(year, SP.POP.TOTL, ggplot(DF, aes(year, SP.POP.TOT...
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Find Duplicate Records in a File
In the world of data preparation a common task is to identify duplicate records in a file or data set. A few years ago, I did most development work in Java, and shudder to think of the amount of code required to accomplish this sort of task. Since that time I been involved in many projects that did not require programming in a specific langua...
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Max Heart Rate Calculations Compared
Physical fitness has become increasingly technical and data driven. I started running a bit in the last few months and have been delving into the prevailing wisdom related to assessing ones health as a baseline for pursuing various fitness goals. Some of the terms related to tracking a heart rate gave me visions of white lab coats, cardiac mo...
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Belgian Astronomers and Exercise Machines
In the twisting paths of human discovery, you never quite know what intellectual enterprise is going to result in a world changing discovery. For instance, the mathematical notion of expected value did not grow up in a sterile, academic environment. In 1654 Blaise Pascal was approached by Chevalier de Méré who was interested in gambling p...
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Benoit Mandelbrot (the Father of Fractals) dead at 85
Nicholas Taleb and Recent tweets indicate that Benoit Mandelbrot has died at age 85. Mandelbrot was a French and American mathematician, best known as the father of fractal geometry. His official biography at Yale does not yet reflect this (it was last updated in March 2010) and his Wikipedia page is protected from editing for the moment...
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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 article and by Alpert in his presentatio...
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2010 ggplot2 Case Study Competition Winners
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. TriesteCheck out their entries to get a glimpse of what is possible with R and ggplot2. Related To leave a commen...
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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, recommendations are referenced either by a number below or by name.# Description 5 Buy4 Positive3 Hold...
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Hadley on a Postage Stamp?
Yet another reason to check out the ggplot2 wiki! 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 other topics. Click here if you're looking to post or find an R/data-science job. Want to shar...
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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. If you make it through the process and get an app accepted, it can be essentially buried where it will re...
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