rstats

Visualising the Metropolis-Hastings algorithm

February 10, 2012 | Corey Chivers

In a previous post, I demonstrated how to use my R package MHadapive to do general MCMC to estimate Bayesian models. The functions in this package are an implementation of  the Metropolis-Hastings algorithm. In this post, I want to provide an intuitive way to picture what is going on ‘under ... [Read more...]

Gauging Interest in a Montreal R User Group

February 7, 2012 | Corey Chivers

Some of us over at McGill’s Biology Graduate Student Association have been developing and delivering R/Statistics workshops over the last few years. Through invited graduate students and faculty, we have tackled  everything from multi-part introductory workshops to get your feet wet, to special topics such as GLMs, GAMs, ... [Read more...]

General Bayesian estimation using MHadaptive

February 6, 2012 | Corey Chivers

If you can write the likelihood function for your model, MHadaptive will take care of the rest (ie. all that MCMC business). I wrote this R package to simplify the estimation of posterior distributions of arbitrary models. Here’s how it works: 1) Define your model (ie the likelihood * prior). In ... [Read more...]

Monty Hall by simulation in R

February 3, 2012 | bayesianbiologist

(Almost) every introductory course in probability introduces conditional probability using the famous Monte Hall problem. In a nutshell, the problem is one of deciding on a best strategy in a simple game. In the game, the contestant is asked to select one of three doors. Behind one of the doors ... [Read more...]

Another Year, Another rApache Release

January 11, 2012 | Jeffrey Horner

I’m feeling chancy, just like those two angels who took a chance on me so many years ago… So I decided to release rApache 1.1.15. You can grab the source from rapache.net. Notable change includes support for deploying Rook applications, which you [Read more...]

Over on F1DataJunkie, 2011 Season Review Doodles…

December 30, 2011 | Tony Hirst

Things have been a little quiet, post wise here, of late, in part because of the holiday season… but I have been posting notes on a couple of charts in progress over on the F1DataJunkie blog. Here are links to the posts in chronological order – they capture the evolution ... [Read more...]

Maps with R, and polygon boundaries

December 21, 2011 | arthur charpentier

With R, it is extremely easy to draw maps. Let us start with something simple, like French regions. Baptiste mentioned on his blog that shapefiles can be downloaded from http://ign.fr/ website. Hence, if you extract the zip file, it is possible to ... [Read more...]

Rescuing Twapperkeeper Archives Before They Vanish, Redux

December 11, 2011 | Tony Hirst

In Rescuing Twapperkeeper Archives Before They Vanish, I described a routine for grabbing Twapperkeeper archives, parsing them, and saving them to a local desktop file using the R programming language (downloading RStudio is the easiest way I know of getting R…). Following a post fron @briankelly (Responding to the Forthcoming ... [Read more...]

Rescuing Twapperkeeper Archives Before They Vanish

December 10, 2011 | Tony Hirst

A couple of years or so ago, various JISC folk picked up on the idea that there might be value in them thar tweets and started encouraging the use of Twapperkeeper for archiving hashtagged tweets around events, supporting the development of that service in exchange for an open source version ... [Read more...]
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