October 2013

drawing surface plots on the IR³ simplex

October 17, 2013 | xi'an

As a result of a corridor conversation in Warwick, I started looking at distributions on the IR³ simplex, and wanted to plot the density in a nice way. As I could not find a proper package on CRAN, the closer being the BMAmevt (for Bayesian Model Averaging for Multivariate ... [Read more...]

Introduction to Feature selection for bioinformaticians using R, correlation matrix filters, PCA & backward selection

October 17, 2013 | Yasset Perez-Riverol

Bioinformatics is becoming more and more a Data Mining field. Every passing day, Genomics and Proteomics yield bucketloads of multivariate data (genes, proteins, DNA, identified peptides, structures), and every one of these biological data units are described by a number of features: length, physicochemical properties, scores, etc. Careful consideration of ...
[Read more...]

What R Has Been Missing

October 17, 2013 | Bob Muenchen

While R has more methods than any other analytics software, it has been missing a crucial feature found in most other packages. SPSS Modeler had it first, way back when they still called it Clementine. Then SAS Institute realized how crucial … Continue reading → [Read more...]

Equidistant points on a map

October 17, 2013 | arthur charpentier

This morning, I had a comment on a recent post, regarding a graph I did upload on the blog, which was extracted from a paper now online (see http://hal.archives-ouvertes.fr/hal-00871883). Jo (from KUL, I guess I can share that piece of information) asked me I was wondering ... [Read more...]

The ACM 2013 Mining Big Data Camp and "Un-Conference"

October 17, 2013 | Joseph Rickert

by Joseph Rickert The 2013 Mining Big Data Camp was held last Saturday at Ebay’s Town Hall Conference Center in San Jose. The San Francisco chapter of the ACM has been sponsoring this data mining themed, “un-conference” event since 2009. Attendance, this year was lighter than I remembered in the past, ... [Read more...]

Mapping Earthquake in Bohol using R

October 17, 2013 | arsalvacion

On my previous post a year ago (on mapping earthquake recorded for the Philippines), it can be seen that there were no earthquake (epicenter) recorded for the province of Bohol. But on the 15th of October there were more than 40 quakes recorded that hi... [Read more...]

beta HPD

October 17, 2013 | xi'an

While writing an introductory chapter on Bayesian analysis (in French), I came by the issue of computing an HPD region when the posterior distribution is a Beta B(α,β) distribution… There is no analytic solution and hence I resorted to numerical resolution (provided here for α=117.5, β=115.5): and got the following return: which ... [Read more...]

Hungarian RUG on ggplot2

October 17, 2013 | Gergely Daróczi

The rather new-born Budapest Users of R Network, the only Hungarian R User Group so far, with already 85+ members, continues its really young traditions to have talks on data visualization and providing a place for Hungarian R users to socialize while having some free pizza and drinks.Our next session ...
[Read more...]

OpenCPU Release 1.0.4

October 17, 2013 | Jeroen Ooms

OpenCPU version 1.0.4 was released to CRAN and Launchpad this week. This release brings some bug fixes/improvements and no breaking changes so you can safely upgrade your 1.0.x installations. Upgrade an existing OpenCPU cloud server using:
sudo apt-get update
sudo apt-get upgrade
Or to install the latest version of the OpenCPU local single-user server in ...
[Read more...]

Fantasy Football Modeling with R

October 16, 2013 | David Smith

Boris Chen, a data scientist for the New York Times, has been running since August a weekly blog with statistical analysis of NFL players, as fodder for Fantasy Football players around the country. Here's how he describes what he does: My model pulls aggregated expert rankings from fantasypros, and I ... [Read more...]

Cont model back after a year

October 16, 2013 | Bogumił Kamiński

During ESSA2013 conference I had a discussion about Cont model I have commented a year ago.In original paper Cont highlights that his model produces distribution of returns characterized by positive excess kurtosis. In this post I want to investig... [Read more...]

accelerated ABC

October 16, 2013 | xi'an

On the flight back from Warwick, I read a fairly recently arXived paper by Umberto Picchini and Julie Forman entitled “Accelerating inference for diffusions observed with measurement error and large sample sizes using Approximate Bayesian Computation: A case study” that relates to earlier ABC works (and the MATLAB abc-sde package) ... [Read more...]

Le Tour

October 16, 2013 | Gianluca Baio

Today I've given the talk on the model for structural zeros and the related R package BCEs0 for the third time in three weeks (this time it was at the London School of Hygiene and Tropical Medicine).Le Tour is going quite well, I think $-$ in... [Read more...]

A first step towards R from spreadsheets

October 16, 2013 | Patrick Burns

Move your data analysis to a computing environment specifically designed for it. Why R and not spreadsheets? Here are three reasons: complexity graphics money Spreadsheets are easily overwhelmed.  Very complex things can be done in spreadsheets — it is just that complex spreadsheets are inefficient and dangerous. Graphics should be considered ... [Read more...]

Latent Gaussian Models and INLA

October 16, 2013 | thiagogm

If you read my post about Fast Bayesian Inference with INLA you might wonder which models are included within the class of latent Gaussian models (LGM), and can therefore be fitted with INLA. Next I will give a general definition about LGM and later I will describe three completely different ... [Read more...]

Creating Colorblind-Friendly Figures

October 16, 2013 | Brian Connelly

Color is often used to display an extra dimension in plots of scientific data. Unfortunately, everyone does not decode color in exactly the same way. This is especially true for those with color vision deficiency, which affects up to 8 percent of the population in its 2 most common forms. As … [Read more...]
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