Monthly Archives: January 2012

R jumps from 25 to 19 in annual TIOBE rankings of programming language popularity

January 16, 2012
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R jumps from 25 to 19 in annual TIOBE rankings of programming language popularity

The TIOBE index ranks popularity of programming languages according to their prevalence on the web. Back in February last year, the R language had risen to #25 in the charts, overtaking both SAS and Matlab. Earlier this month, TIOBE published its annual rankings of programming language popularity for 2011 and R has risen once again: it now ranks #19...

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A slice of S&P 500 skewness history

January 16, 2012
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A slice of S&P 500 skewness history

How symmetric are the returns of the S&P 500? How does the skewness change over time? Previously We looked at the predictability of kurtosis and skewness in S&P constituents.  We didn’t see any predictability of skewness among the constituents.  Here we look at skewness from a different angle. The data Daily log returns of the … Continue reading...

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CRdata.org to shut down?

January 16, 2012
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If you’re one of the R-bloggers or useRs, most probably you had heard about Crdata.org. In the early day, they are two very R related cloud computing services, one is CloudNumbers, another is CrData.org. Recently, we (may) received an email by Hamid ...

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Project Euler in R: Problem 23

January 15, 2012
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I was just looking through the programming language statistics on Project Euler. It shows that only 7% of the problems have been solved in R, whereas 8% have been solved on any kind of spreadsheet.  This is outrageous!Let's look at the solution of...

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Scraping table from any web page with R or CloudStat

January 15, 2012
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Scraping table from any web page with R or CloudStat

Scraping table from any web page with R or CloudStat: You need to use the data from internet, but don’t type, you can just extract or scrape them if you know the web URL. Thanks to XML package from R. It provides amazing readHTMLtable() function. For...

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Crawling facebook with R

January 15, 2012
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Crawling facebook with R

So, let's crawl some data out of facebook using R. Don't get too excited though, this is just a weekend whatif project. Anyway, so for example, I want to download some photos where I'm tagged. First, we need an access token from facebook. I don't know how to get this programmatically, so let's get one manually, log on to facebook...

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Statistical Methods for the Chain Ladder Technique Revisited

January 15, 2012
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Statistical Methods for the Chain Ladder Technique Revisited

Statistical Methods for the Chain Ladder Technique Revisited: Source: Statistical Methods for the Chain Ladder Technique Demo Background Forecasting outstanding claims and setting up suitable reserves to meet these claims is an important part of the b...

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R-squared for multilevel models

January 15, 2012
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Fred Schiff writes: I’m writing to you to ask about the “R-squared” approximation procedure you suggest in your 2004 book with Dr. Hill. I’m a media sociologist at the University of Houston. I’ve been using HLM3 for about two years. Briefly about my data. It’s a content analysis of The post R-squared...

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Merging two data.frame objects while preserving the rows’ order

January 15, 2012
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Merging two data.frame objects while preserving the rows’ order

Merging two data.frame objects in R is very easily done by using the merge function. While being very powerful, the merge function does not (as of yet) offer to return a merged data.frame that preserved the original order of, one of the two merged, data.frame objects. In this post I describe this problem, and offer Read more...

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R and MODFLOW

January 15, 2012
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R and MODFLOW

Here are some functions for reading and writing MODFLOW files from R. I hope to update this in the future!################################################################################### read.modflow.pval ############################################...

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