August 2011

Bayesian analysis: Comparing algorithms Part 1?

August 22, 2011 | Avi

I recently had the opportunity to engage in some Bayesian analysis at work. I was able to state the problem in terms of the lognormal distribution, and took advantage of JAGS and its integration with "R" using the R2jags package. The client was very ha... [Read more...]

R Code for Bow Tie Plots

August 22, 2011 | Carlisle Rainey

Earlier, I discussed the nice properties of bow tie plots for visualizing and understanding inferences from simple randomized treatment experimental designs. R code to quickly create these plots is available here. You can use the command source("htt... [Read more...]

Last and final on Richter’s painting

August 22, 2011 | Julyan Arbel

For a quick recap, Pierre and I supervised a team project at Ensae last year, on a statistical critique of the abstract painting 1024 Colours by painter Gerhard Richter. The four students, Clémence Bonniot, Anne Degrave, Guillaume Roussellet and Astrid Tricaud, did an outstanding job. Here is a selection of ... [Read more...]

More useless statistics

August 22, 2011 | richierocks

Over at the ExploringDataBlog, Ron Pearson just wrote a post about the cases when means are useless. In fact, it’s possible to calculate a whole load of stats on your data and still not really understand it. The canonical dataset for demonstrating this (spoiler alert: if you are doing ... [Read more...]

A view of useR!2011

August 22, 2011 | Pat

Start Brian Ripley The conference was opened with a talk by Brian Ripley.  I’ll distort his talk into 3 points that came across to me. 1. R Core is finite The time available from R Core members is a strictly limited good.  The more that is pushed onto R Core, the ...
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Introduction to Latent Dirichlet Allocation

August 21, 2011 | Edwin Chen

Introduction Suppose you have the following set of sentences: I like to eat broccoli and bananas. I ate a banana and spinach smoothie for breakfast. Chinchillas and kittens are cute. My sister adopted a kitten yesterday. Look at this cute hamster munching on a piece of broccoli. What is latent ... [Read more...]

Prime testing function in R

August 20, 2011 | wrathematics

I was hoping to begin tinkering a bit with the multicore package in R beyond some extremely trivial examples.  Thanks to a combination of R’s dumb quirkiness (for example, being worthless on loops), my poor planning, and general bad programming, my Saturday afternoon tinkering project is ultimately worthless in ... [Read more...]

useR! Conference 2011 highlights

August 20, 2011 | Karl Broman

I was at the useR! Conference at The University of Warwick in Coventry, UK, last week. My goal in going was to learn the latest things regarding (simple) dynamic graphics, (simple) web-based apps, parallel computing, and memory management (dealing with big data sets). I got just what I was hoping ... [Read more...]

Statistical Analysis Functions in R

August 20, 2011 | Nikhil Gopal

Lately, I've been using statistical tests on a daily basis. I've noticed that I have to format my data the same way in order to get it into R (tab-delimited flat file essentially). Every other change in order to prep that data structure for any sort of... [Read more...]

When are averages useless?

August 20, 2011 | Ron Pearson (aka TheNoodleDoodler)

Of all possible single-number characterizations of a data sequence, the average is probably the best known.  It is also easy to compute and in favorable cases, it provides a useful characterization of “the typical value” of a sequence of numbers.  It is not the only such “typical value,” however, nor ... [Read more...]

Reading & plotting phylogenies

August 20, 2011 | Jana

This is a basic procedure, but could come handy. I have been reading and doing a basic manipulations with phylogenetic trees a lot lately, so there is a chunk of code for this. __ library (ape)   # ape is a … Continue reading → [Read more...]

Statistical construction error

August 20, 2011 | Pat

Yes, the title is meant to have two readings. The effect The Numbers Guy, among other examples, talks about the UK Office for National Statistics needing to revise its estimate for the construction sector output because of an error. Original: 2.3% growth Corrected: 0.5% growth Here is the Telegraph article cited by ...
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useR!2011

August 19, 2011 | Mark van der Loo

useR!2011 ended yesterday. First of all, much thanks to the organizers who managed to run a conference with 400+ participants, from 41 countries smoothly. Thumbs up! It was great to meat some people from the R blog-O-sphere in person, like Tal "R-blogg...
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