The New York Times has a splendid example of an infographics this weekend, showing the rise and fall of the Blackberry. Notice the inspired touch of the black circles to trace the outline of Blackberry's market share. They are a...

Last week a preview of version 0.98 of R Studio was released, with lots of new features, including some useful debugging tools. Also part of the release was a new option for creating presentations, which looks like it will be very useful. The presen...

Mladen Kolar, Alessandro Rinaldo and I have uploaded a paper to arXiv entitled “Estimating Undirected Graphs Under Weak Assumptions.” As the name implies, the goal is to estimate an undirected graph from random vectors . Here, each is a vector with coordinates, or features. The graph has nodes, one for each feature. We put an […]

This guy th3james claimed Testing Code Is Simple, and I agree. In the R world, this is not anything new. As far as I can see, there are three schools of R users with different testing techniques: tests are put under package/tests/, and a foo-test.Rou...

A reader asks: “Can you tell me about disagreements on numbers between a severity assessment within error statistics, and a Bayesian assessment of posterior probabilities?” Sure. There are differences between Bayesian posterior probabilities and formal error statistical measures, as well as between the latter and a severity (SEV) assessment, which differs from the standard type […]

The links are back! Read on. Susan Murphy - a statistician - wins a Macarthur Award. Great for the field of statistics (via Dan S. and Simina B., among others). Related: an Interview with David Donoho about the Shaw Prize. Statisticians are … Continue reading →

Mark Duckenfield writes: Some comments on statistics and “bad math”, that I think display a clear misunderstanding of statistics and surveys. http://www.armytimes.com/article/20130714/NEWS/307140016/Marine-officer-Scope-sex-assault-problem-exaggerated and the editorial to which it refers http://online.wsj.com/article/SB10001424127887323582904578484941173658754.html The original report is quite clear about weighting things, smaple sizes, etc. The apparent “clincher” argument in the editorial—that over 50% of unwanted sexual advances […]The post The difficulties of measuring just about anything appeared first on Statistical Modeling, Causal…

Introduction Parallel tempering is a method for getting Metropolis-Hastings based MCMC algorithms to work better on multi-modal distributions. Although the idea has been around for more than 20 years, and works well on many problems, it still isn’t routinely used in applications. I think this is partly because relatively few people understand how it works, […]

The current puzzle is apparently suffering from combinatoric complexity : N persons (with 20≤N≤23) are sitting around a round table and everyone has a green or red token. Both colours are represented. First, each player with a red token take the token of the player immediately to her or his left. Second, each player with […]

Dean Eckles writes: Thought you might be interested in an example that touches on a couple recurring topics: 1. The difference between a statistically significant finding and one that is non-significant need not be itself statistically significant (thus highlighting the problems of using NHST to declare whether an effect exists or not). 2. Continued issues […]The post Difficulties of using statistical significance (or lack thereof) to sift through and compare…

Editor's note: This post was written by Nick Carchedi, a Master's degree student in the Department of Biostatistics at Johns Hopkins. He is working with us to develop software for interactive learning of R and statistics. Inspired by the relative … Continue reading →

I use just-in-time teaching assignments in all my classes now. Vince helpfully sent along these instructions for setting these up on Google. See below. I think Jitts are just wonderful, and they’re so easy to set up, you should definitely be doing them in your classes too. I’ve had more difficulty with Peer Instruction (the […]The post Setting up Jitts online appeared first on Statistical Modeling, Causal Inference, and Social…

August 2013 (8/1) Blogging (flogging?) the SLP: Response to Reply- Xi’an Robert (8/5) At the JSM: 2013 International Year of Statistics (8/6) What did Nate Silver just say? Blogging the JSM (8/9) 11th bullet, multiple choice question, and last thoughts on the JSM (8/11) E.S. Pearson: “Ideas came into my head as I sat on […]

A short post to get back – for my nonlife insurance course – on the interpretation of the output of a regression when there is a categorical covariate. Consider the following dataset > db = read.table("http://freakonometrics.free.fr/db.txt",header=TRUE,sep=";") > attach(db) > tail(db) Y X1 X2 X3 995 1 4.801836 20.82947 A 996 1 9.867854 24.39920 C 997 1 5.390730 21.25119 D 998 1 6.556160 20.79811 D 999 1 4.710276 21.15373 A 1000…

The publishing platform I set up for my forecasting book has now been extended to cover more books and greater functionality. Check it out at www.otexts.org. So far, we have three complete books: Forecasting: principles and practice, by Rob J Hyndman and George Athanasopoulos Statistical foundations of machine learning, by Gianluca Bontempi and Souhaib Ben Taieb Modal logic of strict necessity and possbibility, by Evgeni Latinov and one book currently…