Monthly Archives: October 2012

Using R — A Script Introduction to R

October 17, 2012
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To many people, R is like the Everglades. They’ve heard of it, they know it’s big and has amazing treasures deep inside. Articles in the media can make it look irresistible. But after a personal or even second hand experience …  &#16...

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Fractals and Kronecker product

October 17, 2012
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Fractals and Kronecker product

A few years ago, I went to listen to Roger Nelsen who was giving a talk about copulas with fractal support. Roger is amazing when he gives a talk (I am also a huge fan of his books, and articles), and I really wanted to play with that concept ...

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Rename photos’ names according to shooting time in a batch mode.

October 17, 2012
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For some reason, you want to know the shooting time of your photos. Generally, shooting time can be found as Date modified, if you didn’t made a lot of change to your photos. But, we often make change to our photos, such like copy them from a place to another, edit using Photoshop, Picasa, etc., and then, the Date...

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The consequence of merging insurance companies – Risk simulation and probability of ruin

October 17, 2012
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The consequence of merging insurance companies – Risk simulation and probability of ruin

The merge of two insurance companies enables to curb the probability of ruin by sharing the risk and the capital of the two companies. For example, we can consider two insurance companies, A and B. A is a well known insurance company with a big capital and is dealing with a risk with a low variance. We will assume...

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Use little images as the markers in a scatterplot

October 17, 2012
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Use little images as the markers in a scatterplot

Just saw this post on R-bloggers which has got me excited. I’ve thought about this many times but never looked into it so I can’t honestly say whether this is the first stats software option to do this, despite my … Continue reading →

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The distribution of ideology in the U.S. House (with plyr)

October 17, 2012
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The distribution of ideology in the U.S. House (with plyr)

This Gist has a couple of things going on, I’ll just list them: It downloads the entire history of U.S. House DW-NOMINATE scores from voteview.com It evaluates aggregate statistics, with members grouped by party and congress, with easy weighted ...

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Twitter Analysis of the US Presidential Debate

October 17, 2012
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Twitter Analysis of the US Presidential Debate

The following are word clouds of tweets for each candidate from the October 16, 2012 debate with the bigger words the more often they were used in tweets (click on each word cloud to enlarge): And the net-negative posts for each candidate: Please note that the bigger the word is in the word cloud the

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Japanese Government Bond (JGB) Data Since 1974

October 16, 2012
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Japanese Government Bond (JGB) Data Since 1974

The Ministry of Finance Japan very generously provides data on JGBs back to 1974.  Here is a quick example how to pull it into R and then graph it. From TimelyPortfolio R code in GIST (do raw for copy/paste):

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9 reasons to use RStudio

October 16, 2012
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9 reasons to use RStudio

In no particular order, here are nine reasons why I really like the RStudio IDE for the R statistical programming language. 1) R benefits from an IDE – I accept that in some languages an IDE is unnecessary—Perl is the first example … Continue reading →

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An R Book for the Rest of Us

October 16, 2012
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R for Dummies is here!  Initial reviews are very positive for this book (I haven't gotten it yet).  I am very hopeful though, because the word on the street is that it doesn't assume you have any programming knowledge or much statistical know...

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