December 2012

Finding Numeric Values of Strings using strsplit()

December 19, 2012 | is.R()

Given a random list of words, can you find which has the lowest or highest numerical value when we apply a basic number:letter cipher?  A while back I asked David how he would solve this problem:  http://projecteuler.net/problem=42 Today’s post shows how to take a vector ... [Read more...]

rencontres R à Lyon, 27-28 juin 2013

December 19, 2012 | xi'an

Simon Barthelmé just sent me the announcement that the next French R conference (Rencontres R) will be in Lyon, on June 27-28, 2013, and that the call for propositions is now open. (No possible confusion with MCMSki IV: the later is not in Lyon but Chamonix, not in June but January, ... [Read more...]

R in Insurance Conference, London, 15 July 2013

December 19, 2012 | Markus Gesmann

The first conference on R in Insurance will be held on Monday 15 July 2013 at Cass Business School in London, UK. The intended audience of the conference includes both academics and practitioners who are active or interested in the applications of R in insurance.This one-day conference will focus on applications ...
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Making Friends with Multicollinearity

December 18, 2012 | Joel Cadwell

Not every system of independent variables can be decomposed into separate components, each with its own unique contribution.  Sometimes our individual variables behave “as a unit” and thus become so entangled that we cannot say where the effect of one variable begins and the effect of another variable ends.  In ... [Read more...]

PDQ 6.0.1 is Released

December 18, 2012 | Neil Gunther

As already described previously, the main purpose of Release 6.0.1 Build 121512 is improved compatibility and stability between PDQ and the R statistical environment. For example, many of the PDQ models, previously found in the ../examples/ directory, can now also be accessed via the demo() command in the R-console. Testing was carried ... [Read more...]

Making prettier network graphs with sna and igraph

December 18, 2012 | is.R()

We’ve had some requests for ideas about how to make prettier network graphs, so here is one example, using the sna package for plotting, and the igraph package to calculate PageRank. The help file for gplot is pretty self-explanatory, but Melissa Clarkson has produced the most thorough and impressive ... [Read more...]

R Shiny svg with no d3

December 18, 2012 | klr

Paul Murrell’s Technical Report reminded me that svg in the browser does not require d3.  With his package gridSVG, we can do all sorts of wonderful things without leaving R.  I think I prefer the power of d3.js, but here is an example (doe... [Read more...]

A Quick Note in Weighting with nlme

December 18, 2012 | jebyrnes

I’ve been doing a lot of meta-analytic things lately. More on that anon. But one quick thing that came up was variance weighting with mixed models in R, and after a few web searches, I wanted to post this, more … Continue reading → [Read more...]

Even more Microsoft Postdocs

December 18, 2012 | dan

Microsoft Research NYC [ http://research.microsoft.com/newyork/ ] seeks outstanding applicants for 2-year postdoctoral researcher positions. We welcome applicants with a strong academic record in one of the following areas: * Computational social science: http://research.microsoft.com/cssnyc * Online experimental social science: http://research.microsoft.com/oess_nyc * Algorithmic economics ... [Read more...]

NHS Winter Situation Reports: Shiny Viewer v2

December 18, 2012 | Tony Hirst

Having got my NHS Winter sitrep data scraper into shape (I think!), and dabbled with a quick Shiny demo using the R/Shiny library, I thought I’d tidy it up a little over the weekend and long the way learn a few new presentation tricks. To quickly recap the ... [Read more...]

RStudio and TeXworks working great together

December 18, 2012 | steve

Just now writing a reproducible report in R using RStudio on Ubuntu. So the source is a .Rnw file and I am compiling it with knitr. For the narrative part of the report it is a shame that RStudio doesn’t have autocomplete for latex styles, headings etc. But I ... [Read more...]

Using apply, sapply, lapply in R

December 18, 2012 | Pete

This is an introductory post about using apply, sapply and lapply, best suited for people relatively new to R or unfamiliar with these functions. There is a part 2 coming that will look at density plots with ggplot, but first I thought I would go on a tangent to give some ... [Read more...]

From d3 to pdf (hopefully knitr) with R Shiny

December 17, 2012 | klr

Although I think I like the d3, R, and Shiny team the best, I could definitely envision a big need for multi-page pdf reports created with R, knitr, and latex delivered to the browser with Shiny.  Shiny helpfully provides pre-built functionality t... [Read more...]

RcppArmadillo 0.3.6.1

December 17, 2012 | Thinking inside the box

A first minor bug-fix update by Conrad to the 3.6 series of Armadillo arrived today as version 3.6.1, and we prepared a corresponding version 0.3.6.1 of RcppArmadillo, our wrapper for R and Armadillo. This is now on CRAN, and the changes are summari... [Read more...]

How to select and merge R data frames with SQL

December 17, 2012 | David Smith

The R language provides many features in the language for selecting data from data frames: the "[" operator, logical functions, and utility functions like "subset". But if you know SQL (the query language ubiquitous in database systems), none of this is necessary. With the sqldf package, you can just pretend that ... [Read more...]
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