Monthly Archives: April 2013

Le Monde puzzle [#818]

April 30, 2013
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Le Monde puzzle [#818]

The current puzzle is as follows: Define the symmetric of an integer as the integer obtained by inverting the order of its digits, eg 4321 is the symmetric of 1234. What are the numbers for which the square is equal to the symmetric of the square of the symmetric? I first consulted stackexchange to find

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Missing tikzDevice

April 30, 2013
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I love using tikzDevice. When preparing LaTeX documents I switched to prepare all graphs in GNU R and then port them to TeX using tikzDevice. Recently I have moved to GNU R 3.0.0 and was shocked to find that this package is no longer available on CRAN....

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What the BBC isn’t telling you

April 30, 2013
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What the BBC isn’t telling you

Yesterday Gareth pointed me to this article on the BBC website. The underlying story has to do with Meredith Kercher's murder and the subsequent trial involving mainly her flat-mate Amanda Knox, in Perugia (Italy). As often in these grue...

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Integrating Documentation and Calculation

April 30, 2013
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Integrating Documentation and Calculation Integrating Documentation and Calculation This post is a first in that I've authored it using RStudio. I would guess most people who work in computational finance or quantitative risk are at least familiar with R. Unfortunately R as...

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Has R-help gotten meaner over time? And what does Mancur Olson have to say about it?

April 30, 2013
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Has R-help gotten meaner over time? And what does Mancur Olson have to say about it?

R users know it can be finicky in its requirements and opaque in its error messages. The beginning R user often then happily discovers that a mailing list for dealing with R problems with a large and active user base, R-help, has existed since 1997. Then, the beginning R user wades into the waters, asks… Continue reading →

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Student’s t: location-scale

April 30, 2013
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Student’s t: location-scale

Location-scale extension for Student's t-distribution in R

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SAS Big Data Analytics Benchmark (Part One)

April 30, 2013
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by Thomas Dinsmore On April 26, SAS published on its website an undated Technical Paper entitled Big Data Analytics: Benchmarking SAS, R and Mahout. In the paper, the authors (Allison J. Ames, Ralph Abbey and Wayne Thompson) describe a recent project to compare model quality, product completeness and ease of use for two SAS products together with open source...

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Kalkalash! Pinpointing the Moments “The Simpsons” became less Cromulent

April 30, 2013
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Kalkalash! Pinpointing the Moments “The Simpsons” became less Cromulent

Whenever somebody mentions “The Simpsons” it always stirs up feelings of nostalgia in me. The characters, uproarious gags, zingy one-liners, and edgy animation all contributed towards making, arguably, the greatest TV ever. However, it’s easy to forget that as a TV show “The Simpsons” is still ongoing—in its twenty-fourth season no less. For me, and

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SeminR – au Museum d’histoire naturelle

April 30, 2013
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JOURNEE R LE 24/05/2013 A PARIS - MUSEUM NATIONAL D'HISTOIRE NATURELLE VENEZ PARTAGER VOTRE (ME)CONNAISSANCE DE R ! Au programme : chimie, rapports automatisés, mélanges gaussiens, analyse spatiale, analyse de réseaux, interface R, atlas botanique, bases de données, analyse textuelle et biologie de l'évolutionInscription :...

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ggplot2 graphics in a loop

April 29, 2013
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A client has a specific audit they perform quarterly across 200 of their manufacturing plants. The audit has 8 distinct sections examining the different areas of the plant (shipping, receiving, storage, packaging,etc.) Instead of having one cumulative final score, the audit displays a final score for each section. I wanted to examine the distribution of

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