Monthly Archives: November 2011

project euler – problem 49

November 8, 2011
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The arithmetic sequence, 1487, 4817, 8147, in which each of the terms increases by 3330, is unusual in two ways: (i) each of the three terms are prime, and, (ii) each of the 4-digit numbers are permutations of one another. There are no arithmetic sequences made up of three 1-, 2-, or 3-digit primes,...

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Lending Club – naive data analysis

November 8, 2011
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Lending Club – naive data analysis

Dataspora recently analyzed Lending Club‘s data in a geographical way using the data distributed by the site. Lending Club is an online financial community that brings together creditworthy borrowers and savvy investors so that both can benefit financially. We replace the high cost and complexity of bank lending with a faster, smarter way to borrow

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Web Scraping Google Scholar: Part 2 (Complete Success)

November 8, 2011
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Web Scraping Google Scholar: Part 2 (Complete Success)

This is a followup to a post I uploaded earlier today about web scraping data off Google Scholar. In that post I was frustrated because I’m not smart enough to use xpathSApply to get the kind of results I wanted. However fast-forward to the evening whilst having dinner with a friend, as a passing remark,

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What the frack? Does hydraulic fracturing lead to increased earthquakes?

November 8, 2011
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What the frack?  Does hydraulic fracturing lead to increased earthquakes?

Earthquakes are normal occurrences along the boundaries of major plate margins, such as along the San Andreas fault system of California,  and are less common within plate interiors.  Try telling that, however, to the citizens of Oklahoma who...

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Three free books on R for Statistics

November 8, 2011
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Avril Coghlan, a lecturer at University College Cork in Ireland, has written and made available for free three books ideal for students or practitioners new to R who want to use it for multivariate analysis, time series analysis or biomedical statistics. Each book begins with practical advice for installing and using R in general, before diving into their specialized...

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Error Handling in Lyx & Sweave: using Quantmod (and R, of course)

November 8, 2011
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I do reports for clients with LyX and Sweave. It took me an extremely long time to get them working, but now that they’re working I can do more in an hour and thus charge more per hour. (Which is, like, the point.) If you’re not familiar, here’s ...

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Error Handling in Lyx & Sweave: using Quantmod (and R, of course)

November 8, 2011
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I do reports for clients with LyX and Sweave. It took me an extremely long time to get them working, but now that they’re working I can do more in an hour and thus charge more per hour. If you’re not familiar, here’s a rundown: LaTeX is the stand...

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Using Text Mining to Find Out What @RDataMining Tweets are About

November 8, 2011
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Using Text Mining to Find Out What @RDataMining Tweets are About

This post shows an example on text mining of Twitter data with R packages twitteR, tm and wordcloud. Package twitteR provides access to Twitter data, tm provides functions for text mining, and wordcloud visualizes the result with a word cloud. … Continue reading →

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readGrads – An R package to read and manipulate grads data

November 8, 2011
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I created an R package to read grads data. As far as I know, there is no dedicated package to read grads data. The package is still quite new, any remarks on the documentation or code are more than welcome.… See more ›

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Setting up AWS Cluster to use snow in R

November 8, 2011
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Setting up AWS Cluster to use snow in R

Setting up AWS Cluster I wanted to setup an AWS cluster to take a shot at a Kaggle contest – DunnHumby Challenge http://www.kaggle.com/c/dunnhumbychallenge For this, I found StarCluster to be of great help. It allows you to set-up AWS nodes in a few lines of code and does much more (choosing AMIs and cluster configurations)

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