## Biostatistics seminar

September 10, 2013
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As part of the activities of the UCL Biostatistics Network, we organise regular seminars, to which we invite (usually relatively local $-$ for budget reasons only!) speakers. September is the start of the new term, and we'll kick off with what (in...

## A Monty Simulation

September 10, 2013
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I was listening to Science Friday from Sep 6th. and one of the discussions by Ira Flatow was on the well known Monty Hall Problem.  This problem has been hashed out many times and in fact I was first introduced to the probability aspects of the problem while taking my introductory to statistics class when […]

## ave and the "[" function in R

September 10, 2013
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The ave function in R is one of those little helper function I feel I should be using more. Investigating its source code showed me another twist about R and the "[" function. But first let's look at ave.The top of ave's help page reads:Group Averages ...

## Peircean Induction and the Error-Correcting Thesis (Part I)

September 10, 2013
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Today is C.S. Peirce’s birthday. I hadn’t blogged him before, but he’s one of my all time heroes. You should read him: he’s a treasure chest on essentially any topic. I’ll blog the main sections of a (2005) paper over the next few days. It’s written for a very general philosophical audience; the statistical parts […]

## Sports journalists reported lies and then lie some more, just like dopers

September 9, 2013
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Note: This is part 2 of a three-part response to an important article that appeared in the New York Times in August. See Part 1 here. *** Part 2 deals with a few disagreements I have with Tim Rohan, who is the author of the article. The first sentence of Rohan's article took my breath away: Doping experts have long known that drug tests catch only a tiny fraction of…

## The Eve of the NYC Democratic Mayoral Primary Election

September 9, 2013
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It is the eve of the New York City Democratic mayoral primary election.  This is a simple follow-up on my post from last Friday as I was curious how the final pre-Election Day polling was going to fall.  It’s fairly clear who is going to get the most votes.  Though we have a very good […]

## False memories and statistical analysis

September 9, 2013
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Alison George interviews Elizabeth Loftus. It’s good stuff, important stuff, and it relates to my view as a statistician that uncertainty and variation are important. Uncertainty is relevant here because there are things that people remember that never happened. Variation is important because different people remember different things. Loftus’s work also seems relevant to the […]The post False memories and statistical analysis appeared first on Statistical Modeling, Causal Inference, and…

## Light entertainment: the Wired touted pie

September 9, 2013
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Via Data Viz News, and sourced to Wired Perhaps the yellow piece gives us a clue: it represents 1 percent, which is the perceived importance of "sophisticated visual aids" in a TED talk.

## Solving differential equations in SAS

September 9, 2013
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Differential equations arise in the modeling of many physical processes, including mechanical and chemical systems. You can solve systems of first-order ordinary differential equations (ODEs) by using the ODE subroutine in the SAS/IML language, which solves initial value problems. This article uses the equations of motion for the classic simple [...]

## Watch the TCC Keynote Live on Monday

September 9, 2013
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The Tableau Customer Conference (TCC) starts tomorrow with a big keynote that includes demos of upcoming features. Watch it live at this link, and see me demo something new and exciting. Now don’t think that this is purely a marketing keynote. The people there are almost all customers already, so they don’t need to be […]

## LaTeX: Introduction – First Document

September 9, 2013
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Let us start with a simple $\mathrm{\LaTeX}$ document. Open your text editor (Texmaker, TeXnicCenter, TeXworks, etc.), then go to File>New, and paste the following:Save this and make sure the file has .tex extension. You should have something like t...

## How to study statistics (Part 1)

September 9, 2013
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To students of statistics Most of my posts are directed at teachers and how to teach statistics. The blog this week and next is devoted to students. I present principles that will help you to learn statistics. I’m turning them … Continue reading →

## Program chair

September 8, 2013
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The other day, Julien asked me if I wanted to run for program chair of the ISBA Section on Biostatistics and Pharmaceutical Statistics, of which I am a member.I thought about it for a bit and then I decided to go for it. I'm up against the incumbe...

## Jobs @ UCL

September 8, 2013
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Irene (who, among other things, is one of the co-apps in the RDD project $-$ in fact, she'll be a fundamental part of the research!) sent me a couple of job adverts for research assistant positions that will shortly be available at UCL. She and the job...

## Mixed models; Random Coefficients, part 1

September 8, 2013
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Continuing with my exploration of mixed models I am now at the first part of random coefficients: example 59.5 for proc mixed (page 5034 of the SAS/STAT 12.3 Manual). This means I skipped examples 59.3 (plotting the likelihood) and 59.4 (known G and R)...

## What we need here is some peer review for statistical graphics

September 8, 2013
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Under the heading, “Bad graph candidate,” Kevin Wright points to this article [link fixed], writing: Some of the figures use the same line type for two different series. More egregious are the confidence intervals that are constant width instead of increasing in width into the future. Indeed. What’s even more embarrassing is that these graphs […]The post What we need here is some peer review for statistical graphics appeared first…

## Forecast-Error Insurance

September 8, 2013
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Yale economists Mark Rosenzweig and Chris Udry have a new paper, "Forecasting Profitability." It's related to a project of theirs that examines the Indian Meteorological Department's annual monsoon rainfall forecasts and their effec...

## Visualizing optimization process

September 8, 2013
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One of the approaches to graph drawing is application of so called force-directed algorithms. In its simplest form the idea is to layout the nodes on plane so that all edges in the graph have approximately equal length. This problem has very intuitive ...

## Linear regression from a contingency table

September 8, 2013
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This morning, Benoit sent me an email, about an exercise he found in an econometric textbook, about linear regression. Consider the following dataset, Here, variable X denotes the income, and Y the expenses. The goal was to fit a linear regression (actually, in the email, it was mentioned that we should try to fit an heteroscedastic model, but let us skip this part). So Benoit’s question was more or less: how…

## Job openings at American University

September 7, 2013
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American University in Washington, D.C. has two full-time tenure-line positions available: An ideal candidate will have facility with computation, and can identify specific prospects for on-campus collaboration, possibly interdepartmental. We are particularly interested in candidates who can assist colleagues who need to deal with data sets that are too large, distributed, or heterogeneous to be […]The post Job openings at American University appeared first on Statistical Modeling, Causal Inference, and…

## Here’s what happened when I finished my PhD thesis

September 7, 2013
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May 11, midday: Made a list of all the things I needed to do to finish the thesis. May 12, midday: Tear up the list, decide to finish it with what I had at hand. May 13, 7am: Thesis finished. It was very satisfying. Right now, I remain on a high f...

## A newcomer at Statisfaction

September 7, 2013
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Hi Statisfied readers, I am Nicolas Chopin,  a Professor of Statistics at the ENSAE, and my colleagues and good friends that manage Statisfaction kindly agreed that I would join their blog. I work mostly on “Bayesian Computation”, i.e. Monte Carlo and non-Monte Carlo methods to compute Bayesian quantities; a strong focus of my research is […]

September 7, 2013
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Are you using MS Word for your paper works? And MS PowerPoint for your presentations? Why not try something that is FREE, powerful than those commercial products? Something that is quite challenging but FUN to use. Introducing $\mathrm{\LaTeX}$, a d...