Monthly Archives: July 2011

Contributions to the R Project

July 4, 2011
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The R Project would not exist without the contributions of the R Core Group, the 21 volunteer statisticians and computer scientists from around the world who have donated their time and expertise to create the R langauge, its core packages, and manage its regular release and binary distribution process via the CRAN network. Many Core Group members also tirelessly...

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Questions about quantum computing

July 4, 2011
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I read this article by Rivka Galchen on quantum computing. Much of the article was about an eccentric scientist in his fifties named David Deutch. I’m sure the guy is brilliant but I wasn’t particularly interested in his not particularly interesting life story (apparently he’s thin and lives in Oxford). There was a brief description

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Reverse Iteration

July 3, 2011
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Reverse Iteration

Time to horrify some people. First let's include the code we wrote last time, > source("pretend.R") and the dependency-tracking environment it creates will be used to run all the following examples. Let's look at, I don't know, I'm just trying to demonstrate a language feature so uh... band-pass filtering Gaussian noise. Here's some noise:

Testing for valid variable names

July 3, 2011
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Testing for valid variable names

I have something a fondness for ridiculous variable names, so it’s useful to be able to check whether my latest concoction is legitimate. More so if it is automatically generated. Not having an is_valid_variable_name function is one of those odd omissions from R, and the assign function doesn’t check validity. To recap, there are a

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Best graph ever

July 3, 2011
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Best graph ever

Best graph ever. LARGEST EVER DIFFERENCE BETWEEN 328 and 327 SPOTTED IN NEW YORK CITY

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Learning SAS

July 3, 2011
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Learning SAS

I want to learn the heavy-weight of Statistical softwares - SAS. It seems like the default choice for high-end statistics and I want to understand why.I'm working in the healthcare practice in our firm and want to analyze claims and credit data (Teraby...

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R performance optimization

July 3, 2011
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The blog The Average Investors Blog R posted a nice report about accelerating a default Debian R installation and added some details about his benchmarks in the comment section

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Experimental reasoning in social science

July 2, 2011
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As a statistician, I was trained to think of randomized experimentation as representing the gold standard of knowledge in the social sciences, and, despite having seen occasional arguments to the contrary, I still hold that view, expressed pithily by Box, Hunter, and Hunter (1978) that “To find out what happens when you change something, it

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GIS on a shoestring – Getting traveltimes from google

July 2, 2011
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The analysis of geospatial information is currently a big trend in medicine and public health. Even though some may want to convince you that this can only be achieved with the latest and most expensive software, I am not convinced. First, analysis  of spatial data dates back to at least 1856 when John Snow investigated

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The R apply function – a tutorial with examples

July 2, 2011
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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...

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