Monthly Archives: October 2014

Brazilian latest polls and house effects

October 25, 2014
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Brazilian latest polls and house effects

The latest polls just released tonight are suggesting a numerical tie between Dilma Rousseff (PT) and Aecio Neves (PSDB) considering the limit of the margin of error. Actually, these polls fired up a possible game-changing for the opposition over the government as some of the polls did capture any impact stimulated by the televised debate … Read More →

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Call for participation: AusDM 2014, Brisbane, 27-28 November

October 25, 2014
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Call for participation: AusDM 2014, Brisbane, 27-28 November

********************************************************* 12th Australasian Data Mining Conference (AusDM 2014) Brisbane, Australia 27-28 November 2014 http://ausdm14.ausdm.org/ ********************************************************* The Australasian Data Mining Conference has established itself as the premier Australasian meeting for both practitioners and researchers in data mining. Since AusDM’02 the conference … Continue reading →

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What are the chances of Dilma tomorrow?

October 25, 2014
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What are the chances of Dilma tomorrow?

Although polling data are the most common source in an electoral campaign, there are also models that use prediction markets data (trade contracts flow) as the source of information about who is going to win the election. What is the best way of predicting an election is up to debate, but models based on the … Read More →

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RSQLite 1.0.0

October 25, 2014
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RSQLite 1.0.0

I’m very pleased to announce a new version of RSQLite 1.0.0. RSQLite is the easiest way to use SQL database from R: library(DBI) # Create an ephemeral in-memory RSQLite database con TRUE # Fetch all results

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Hungarian RUG guest speakers: Romain Francois and Matt Dowle

October 25, 2014
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Hungarian RUG guest speakers: Romain Francois and Matt Dowle

The Budapest Users of R Network, which is the only one active Hungarian R User Group so far, was founded a bit more than a year ago, and I was really happy to see more than 200 registrations before its first anniversary. The RUG proved to be active and popular in Hungary, which makes me feel extremely proud as...

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Iterative OLS Regression Using Gauss-Seidel

October 24, 2014
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Iterative OLS Regression Using Gauss-Seidel

I just finished covering a few numerical techniques for solving systems of equations, which can be applied to find best-fit lines through a give set of data points. The four points  are arranged into an inconsistent system of four equations and two unknowns: The system can be represented in matrix form: The least-squares solution vector can be … Continue reading Iterative...

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jsonlite 0.9.13: high performance number formatting

October 24, 2014
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jsonlite 0.9.13: high performance number formatting

The jsonlite package implements a robust, high performance JSON parser and generator for R, optimized for statistical data and the web. This week version 0.9.13 appeared on CRAN which is the third release in a relatively short period focusing on performance optimization. Fast number formatting Version 0.9.11 and 0.9.12 had already introduced majors speedup by porting critical bottlenecks...

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Using WrightMap with the TAM package

October 24, 2014
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Using WrightMap with the TAM package

WrightMap features close integration with Conquest, allowing you to easily read from its output files. However, this is just a nice convenience for Conquest users, as WrightMap was designed to create beautiful item-person plots simply reading standard R matrices; all you need is a matrix of item parameters and a matrix of person estimates and you can start creating...

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Rocker: Docker containers for R

October 24, 2014
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If you haven't heard the buzz about Docker but you often need to spin up Linux-based VM's for testing, simulations, etc. then you should check it out. In short, Docker rocks: we use it for testing our Linux-based distros of Revolution R Open. If you want to use R and Docker together, Dirk Eddelbuettel and Carl Boettiger have made...

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Simple Probs

October 24, 2014
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Simple Probs

Somebody said me that it'd be really nice to see a posting with simple simulations for the runoff this weekend. Answering such a call, this is the best I could come up with. The following is a highly simplified simulation that does not account for time trends nor for house effects. But it's still theoretically … Read More →

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