Monthly Archives: October 2011

Reading HTML pages in R for text processing

October 10, 2011
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We were talking with one of my colleagues about doing some text analysis—that, by the way, I have never done before—for which the first issue is to get text in R. Not any text, but files that can be accessed … Continue reading →

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An R function to determine if you are a data scientist

October 10, 2011
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An R function to determine if you are a data scientist

“Data scientist” is one of the buzzwords in the running for rebranding applied statistics mixed with some computing. David Champagne, over at Revolution Analytics, described the skills for being a data scientist with a Venn Diagram. Just for fun, ...

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Plot Animation with Imported Images

October 10, 2011
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Plot Animation with Imported Images

...I really dig the animation package! ..so here's the outcome of my firsts encounters with saveHTML() - I produced an animation with pre-existing images by utilizing the functions readJPEG() and rasterImage() from the R-packages jpeg and ReadImage...

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How can you do a smart job getting data from internet?

October 9, 2011
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I’d like to explore more the capabilities of my statistical packages to get data online and allocate it in memory instead of download each dataset by hand. After all, I found this task is pretty easy, but got me out of bed for one night trying to find the most efficient way to loop across

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The Skills of a Data Miner

October 9, 2011
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Data mining is not only statistics, even if statistics is the most recognized academic component of it. It also includes data cleaning, machine learning and data visualization. The scarce factor is the ability to understand that data and extract value ...

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Equality of Covariances Matrices Test in R (varcomp)

October 9, 2011
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Equality of Covariances Matrices Test in R (varcomp)

This is a piece of code I implemented in 2004, which was supposed to be part of an R-package in multivariate testing (to be named, rather creatively, mvttests). Time has flown, I haven’t still got around to implementing the said package, but people keep asking me for the varcomp function, so here it is, for

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understanding computational Bayesian statistics

October 9, 2011
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understanding computational Bayesian statistics

I have just finished reading this book by Bill Bolstad (University of Waikato, New Zealand) which a previous ‘Og post pointed out when it appeared, shortly after our Introducing Monte Carlo Methods with R. My family commented that the cover was nicer than those of my own books, which is true. Before I launch into

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Sphericity Test for Covariance Matrices in R (sphericity.test)

October 9, 2011
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Sphericity Test for Covariance Matrices in R (sphericity.test)

This is a piece of code I implemented in 2004, which was supposed to be part of an R-package in multivariate testing (to be named, rather creatively, mvttests). Time has flown, I haven’t still got around to implementing the said package, but people keep asking me for the sphericity.test function, so here it is, for

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Operating on datasets inside a function

October 9, 2011
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There are times when we need to write a function that makes changes to a generic data frame that is passed as an argument. Let’s say, for example, that we want to write a function that converts to factor any … Continue reading →

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Open Street maps

October 8, 2011
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Open Street maps

There have been some exciting developments in the Deducer ecosystem over the summer which should go into CRAN release in the next few months. Today I'm going to give a quick sneak peek at an Open Street Map - R connection with accompanying GUI. This post will just show the non-GUI components. The first part of the

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