July 2013

Read GRASS raster directly into R?

July 15, 2013 | rmkrug

There was always the issue which bugged me: Why do I have to go through an intermediate format on disk when I want to import a GRASS raster layer into R? At the moment, when I use readRAST6(), the raster layer is exported from GRASS into an intermediate formate (I ... [Read more...]

useR 2013

July 15, 2013 | rmkrug

Four days sunshine, heat and R – isn’t that a dream? Well, I guess for some this would be a nightmare, but that depends if you like heat or not. And it was hot: at 21:00 it was still 35 degrees in the sun. So that aspect is covered, and we can ... [Read more...]

R in Insurance Presentation

July 15, 2013 | adamleerich

I will be presenting with Simon Brickman today at the inaugural “R in Insurance” conference at the Cass Business School in London. You can download the content from my public Dropbox folder. There was a bit of magic in how … Continue reading → [Read more...]

Imputing Missing Data With Expectation – Maximization

July 14, 2013 | Wesley

It can be fairly common to find missing values in a dataset. Having only a few missing values isn’t generally a problem and those records can be deleted listwise. In other words the entire record is simply removed from the analysis. The problem is even with a limited amount ... [Read more...]

Partial Least Squares Regression in R

July 14, 2013 | Cory Lesmeister

Partial Least Squares Regression:This week I will be doing some consulting around Structural Equation Modeling (SEM) techniques to solve a unique business problem.  We are trying to identify customer preference for various products and traditional regression is not adequate because of the high dimensional component to the data set ... [Read more...]

R talks to Weka about Data Mining

July 14, 2013 | fibosworld

R provides us with excellent resources to mine data, and there are some good overviews out there: Yanchang’s website with Examples and a nice reference card The rattle-package that introduces a nice GUI for R, and Graham William’s compendium of tools The caret-package that offers a unified interface ...
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useR 2013 was a blast!

July 14, 2013 | Rasmus Bååth

I had a great time at useR 2013 in Albacete, Spain. The food was great, the people were fun and the weather was hot. A pleasant surprise was that I won the useR data analysis contest with my submission “Modeling Match Results in La Liga Using a Hierarchical Bayesian Poisson Model.” ... [Read more...]

Rain in Netherlands during the past 100 years

July 14, 2013 | Wingfeet

Climate has my interest. But discussions on climate change seem to be focused on temperature. In real life, we look at temperature, rain, sunshine and wind. I was therefor happy to find a load of rain data on Royal Netherlands Meteorological Institute.... [Read more...]

Slides from Rcpp talk in Sydney

July 13, 2013 | Thinking inside the box

The Sydney Users of R Forum (SURF) were kind enough to host me two days (well, three with the traveling ...) ago for an hour-long talk on Rcpp. Apparently, it set a new attendance record for this R user group. My thanks to Louise and Eugene for hosti... [Read more...]

List Comprehensions in R

July 13, 2013 | Ronert Obst

List comprehensions in Python or Haskell are popular and useful tools to filter a list given some predicates. The foreach package by Revolution Analytics gives us a handy interface to list comprehensions in R. Quicksort is a recursive algorithm to ... [Read more...]

Zero to hero

July 13, 2013 | Gianluca Baio

Recently, I've been working on a paper, which I think is coming along nicely. The basic problem is like this: in a health economic evaluation, sometimes data are collected on a sample of individuals. Say, for example, that $n_0$ subjects are given a st... [Read more...]

UseR! 2013 Highlights

July 13, 2013 | Max Kuhn

The conference was excellent this year. My highlights: Bojan Mihaljevic gave a great presentation on machine learning models built from network models. Their package isn't on CRAN yet, but I'm really looking forward to it. Jim Harner's presentation ... [Read more...]

Science link goodness for the week of July 12th

July 13, 2013 | Ryan Brown

Hello paleoposse! This week I bring you some of my favorite science articles from around the internet. In keeping with the podcast theme, I’ve divided it up into things that are science, things that are sort of science, and things that wish they were science. This week we cover ... [Read more...]

Faster Multivariate Normal densities with RcppArmadillo and OpenMP

July 13, 2013 | Rcpp Gallery

The Multivariate Normal density function is used frequently in a number of problems. Especially for MCMC problems, fast evaluation is important. Multivariate Normal Likelihoods, Priors and mixtures of Multivariate Normals require numerous evaluations, thus speed of computation is vital. We show a twofold increase in speed by using RcppArmadillo, and ...
[Read more...]
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