April 2013

Le Monde puzzle [#818]

April 30, 2013 | xi'an

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 ...
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Missing tikzDevice

April 30, 2013 | Bogumił Kamiński

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.... [Read more...]

What the BBC isn’t telling you

April 30, 2013 | Gianluca Baio

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... [Read more...]

Integrating Documentation and Calculation

April 30, 2013 | Phil Joubert

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 it existed until two years ago was borderline ... [Read more...]

SAS Big Data Analytics Benchmark (Part One)

April 30, 2013 | Thomas W DInsmore

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 ... [Read more...]

SeminR – au Museum d’histoire naturelle

April 30, 2013 | G-Tch

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 : http://rug.mnhn.... [Read more...]

ggplot2 graphics in a loop

April 29, 2013 | Kevin Davenport

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 ... [Read more...]

…about R, for beginners

April 29, 2013 | mareviv

These days I was remembering my beginnings as a linux user few years ago, and how I found R (possibly in a very unlikely way: searching for a SPSS alternative in Linux). For two years, R had been almost impossible … Sigue leyendo → [Read more...]

Feature Selection Strikes Back (Part 1)

April 29, 2013 | Max Kuhn

In the feature selection chapter, we describe several search procedures ("wrappers") that can be used to optimize the number of predictors. Some techniques were described in more detail than others. Although we do describe genetic algorithms and how they can be used for reducing the dimensions of the data, this ... [Read more...]

A Brief Tour of the Trees and Forests

April 29, 2013 | Wesley

Tree methods such as CART (classification and regression trees) can be used as alternatives to logistic regression. It is a way that can be used to show the probability of being in any hierarchical group. The following is a compilation of many of the key R packages that cover trees ... [Read more...]

d3 <- R with rCharts and slidify

April 29, 2013 | klr

I believe that the NY Times interactive feature 512 Paths to the White House is one of the best visualizations of all time.  It is even better when we have details on the process of creating this marvel.   Although the graphic is not suited for other data sources (please tell me ... [Read more...]

How UpStream uses R for Attribution Analysis

April 29, 2013 | David Smith

Major retailers like Williams Sonoma use UpStream Software for marketing analytics, including revenue attribution, targeting, and optimization. In the video below Tess Nesbitt (senior statistician at UpStream) describes how she uses Revolution R Enterprise and Hadoop to figure out the impact on various marketing channels (for example direct mail, email ... [Read more...]

Webinar May 1: What’s new in Revolution R Enterprise 6.2

April 29, 2013 | David Smith

Revolution R Enterprise 6.2 is now available, and includes many new features that enhance the performance, scalability and enterprise readiness of R. On May 1, product manager Thomas Dinsmore will give an overview of the new features in a 30-minute webinar. You can register for the webinar (and the post-webinar slides and ... [Read more...]

GSoC Proposal 2013: Biodiversity Visualizations using R

April 29, 2013 | vijaybarve

I am applying for Google Summer of Code 2013 with this “Biodiversity Visualizations using R” proposal. I am posting this idea to get feedback and suggestions from Biodiversity Informatics community. [During next few days I will keep updating this to accommodate suggestions. The example visualizations here are crude examples of the ... [Read more...]
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