The current state of the Stan ecosystem in R

April 24, 2018
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This post is by Jonah. Last week I posted here about the release of version 2.0.0 of the loo R package, but there have been a few other recent releases and updates worth mentioning. At the end of the post I also include some general thoughts on R package development with Stan and the growing number of […] The post The current state of the Stan ecosystem in R appeared first on…

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An easy and efficient way to create indicator variables (a.k.a. dummy variables) from a categorical variable in SAS

Introduction In statistics and biostatistics, the creation of binary indicators is a very useful practice. They can be useful predictor variables in statistical models. They can reduce the amount of memory required to store the data set. They can treat a categorical covariate as a continuous covariate in regression, which has certain mathematical conveniences. However, […]

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A few words on a few words on Twitter’s 280 experiment.

April 24, 2018
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A few words on a few words on Twitter’s 280 experiment.

Gur Huberman points us to this post by Joshua Gans, “A few words on Twitter’s 280 experiment.” I hate twitter but I took a look anyway, and I’m glad I did, as Gans makes some good points and some bad points, and it’s all interesting. Gans starts with some intriguing background: Twitter have decided to […] The post A few…

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The cargo cult continues

April 23, 2018
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Juan Carlos Lopez writes: Here’s a news article: . . . Here’s the paper: . . . [Details removed to avoid embarrassing the authors of the article in question.] I [Lopez] am especially bothered by the abstract of this paper, which makes bold claims in the context of a small and noisy study which measurements […] The post The cargo…

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Ghysels and Marcellino on Time-Series Forecasting

April 23, 2018
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If you're teaching a forecasting course and want a good text, or if you're just looking for an informative and modern treatment, see Applied Economic Forecasting Using Time Series Methods, by Eric Ghysels and Massimilliano Marcellino. It will be publis...

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Beauty is in the eyes of the fishes

April 23, 2018
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Beauty is in the eyes of the fishes

Kaiser Fung, creator of Junk Charts and Principal Analytics Prep, looks at an old chart from Germany from the 1960s about swimming pools.

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Beauty is in the eyes of the fishes

April 23, 2018
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Beauty is in the eyes of the fishes

Kaiser Fung, creator of Junk Charts and Principal Analytics Prep, looks at an old chart from Germany from the 1960s about swimming pools.

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Obesity index: Measuring the fatness of probability distribution tails

April 23, 2018
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A probability distribution is called “fat tailed” if its probability density goes to zero slowly. Slowly relative to what? That is often implicit and left up to context, but generally speaking the exponential distribution is the dividing line. Probability densities that decay faster than the exponential distribution are called “thin” or “light,” and densities that […]

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The 80-20 rule for blogs

April 23, 2018
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The 80-20 rule for blogs

You've probably heard about the "80-20 Rule," which describes many natural and manmade phenomena. This rule is sometimes called the "Pareto Principle" because it was discovered by Vilfredo Pareto (1848–1923) who used it to describe the unequal distribution of wealth. Specifically, in his study, 80% of the wealth was held [...] The post The 80-20 rule for blogs appeared first…

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What can we learn from data analysis failures?

April 23, 2018
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Back in February, I gave a talk at the Walter and Eliza Hall Research Institute in Melbourne titled “Lessons in Disaster: What Can We Learn from Data Analysis Failures?” This talk was quite different from talks that I usually give on comp...

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Forecasting in NYC: 25-27 June 2018

Forecasting in NYC: 25-27 June 2018

In late June, I will be in New York to teach my 3-day workshop on Forecasting using R. Tickets are available at Eventbrite. This is the first time I’ve taught this workshop in the US, having previously run it in the Netherlands and Australia. It ...

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Individual and aggregate causal effects: Social media and depression among teenagers

April 22, 2018
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This one starts out as a simple story of correction of a statistical analysis and turns into an interesting discussion of causal inference for multilevel models. Michael Daly writes: I saw your piece on ‘Have Smartphone Destroyed a Generation’ and wanted to flag some of the associations underlying key claims in this debate (which is […] The post Individual and…

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There’s nothing embarrassing about self-citation

April 22, 2018
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Someone sent me an email writing that one of my papers “has an embarrassing amount of self-citation.” I’m sorry that this person is embarrassed on my behalf. I’m not embarrassed at all. If I wrote something in the past that’s relevant, it makes sense to cite it rather than repeating myself, no? A citation is […] The post There’s nothing…

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What is “blogging”? Is it different from “writing”?

April 21, 2018
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Thomas Basbøll wrote: To blog is not to write in a particular style, or publish in a particular form. Rather, blogging is an experience that is structured by a particular functionality. . . . What makes it a blog is a structural coordination of the blogger and the audience. . . . Blogging, in my […] The post What is…

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Carol Nickerson investigates an unfounded claim of “17 replications”

April 20, 2018
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Carol Nickerson sends along this report in which she carefully looks into the claim that the effect of power posing on feelings of power has replicated 17 times. Also relevant to the discussion is this post from a few months ago by Joe Simmons, Leif Nelson, and Uri Simonsohn. I am writing about this because […] The post Carol Nickerson…

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Pastagate!

April 19, 2018
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[relevant picture] In a news article, “Pasta Is Good For You, Say Scientists Funded By Big Pasta,” Stephanie Lee writes: The headlines were a fettuccine fanatic’s dream. “Eating Pasta Linked to Weight Loss in New Study,” Newsweek reported this month, racking up more than 22,500 Facebook likes, shares, and comments. The happy news also went […] The post Pastagate! appeared…

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Postdoc opportunity at AstraZeneca in Cambridge, England, in Bayesian Machine Learning using Stan!

April 19, 2018
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Here it is: Predicting drug toxicity with Bayesian machine learning models We’re currently looking for talented scientists to join our innovative academic-style Postdoc. From our centre in Cambridge, UK you’ll be in a global pharmaceutical environment, contributing to live projects right from the start. You’ll take part in a comprehensive training programme, including a focus […] The post Postdoc opportunity…

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Psychometrics corner: They want to fit a multilevel model instead of running 37 separate correlation analyses

April 19, 2018
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Anouschka Foltz writes: One of my students has some data, and there is an issue with multiple comparisons. While trying to find out how to best deal with the issue, I came across your article with Martin Lindquist, “Correlations and Multiple Comparisons in Functional Imaging: A Statistical Perspective.” And while my student’s work does not […] The post Psychometrics corner:…

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Upcoming speaking engagments

April 19, 2018
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Upcoming speaking engagments

I have a couple of public appearances coming up soon. The East Bay R Language Beginners Group: Preparing Datasets – The Ugly Truth & Some Solutions, Tuesday, May 1, 2018 at Robert Half Technologies, 1999 Harrison Street, Oakland, CA, 94612. Official May 2018 BARUG Meeting: rquery: a Query Generator for Working With SQL Data, Tuesday, … Continue reading Upcoming speaking…

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Trichotomous

April 19, 2018
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Trichotomous

Regarding this paper, Frank Harrell writes: One grammatical correction: Alvan Feinstein, the ‘father of clinical epidemiology’ at Yale, educated me about ‘trichotomy’. dichotomous = Greek dicho (two) + tomous (cut). Three = tri so the proper word would be ‘tritomous’ instead of ‘trichotomous’. Uh oh. I can’t bring myself to use the word “tritomous” as […] The post Trichotomous appeared…

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Playfulness in data visualization

April 19, 2018
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Playfulness in data visualization

The Newslab project takes aggregate data from Google's various services and finds imaginative ways to enliven the data. The Beautiful in English project makes a strong case for adding playfulness to your data visualization. The data came from Google Translate....

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Major depression, qu’est-ce que c’est?

April 19, 2018
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Attention conservation notice: 1100+ words on a speculative scientific paper, proposing yet another reformation of psychopathology. The post contains equations and amateur philosophy of science. Reading it will not make you feel better. — Lar...

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Process versus outcome productivity

April 19, 2018
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Several times over the last few weeks my hatred of Doodle polls has come up in meetings. I think the polling technology is great, but I’m still frustrated by the polls. Someone asked what I’d rather have happen and I said: “set the ...

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