Regression Coefficients & Units of Measurement

April 14, 2015
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Regression Coefficients & Units of Measurement

A linear regression equation is just that - an equation. This means that when any of the variables - dependent or explanatory - have units of measurement, we also have to keep track of the units of measurement for the estimated regression coefficients....

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“For better or for worse, academics are fascinated by academic rankings . . .”

April 14, 2015
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I was asked to comment on a forthcoming article, “Statistical Modeling of Citation Exchange Among Statistics Journals,” by Christiano Varin, Manuela Cattelan and David Firth. Here’s what I wrote: For better or for worse, academics are fascinated by academic rankings, perhaps because most of us reached our present positions through a series of tournaments, starting […] The post “For better or for worse, academics are fascinated by academic rankings .…

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Plotting tables alsongside charts in R

April 14, 2015
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Plotting tables alsongside charts in R

Occasionally I'd like to plot a table alongside a chart in R, e.g. to present summary statistics of the graph itself. Thanks to the gridExtra package this is quite straightforward. The function tableGrob creates a table like plot of a data frame, while...

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Philosophy of Statistics Comes to the Big Apple! APS 2015 Annual Convention — NYC

April 14, 2015
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Philosophy of Statistics Comes to the Big Apple! APS 2015 Annual Convention — NYC

Start Spreading the News…..  The Philosophy of Statistics: Bayesianism, Frequentism and the Nature of Inference, 2015 APS Annual Convention Saturday, May 23  2:00 PM- 3:50 PM in Wilder (Marriott Marquis 1535 B’way)     Andrew Gelman Professor of Statistics & Political Science Columbia University Stephen Senn Head of Competence Center for Methodology and Statistics (CCMS) […]

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failures and uses of Jaynes’ principle of transformation groups

April 13, 2015
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failures and uses of Jaynes’ principle of transformation groups

This paper by Alon Drory was arXived last week when I was at Columbia. It reassesses Jaynes’ resolution of Bertrand’s paradox, which finds three different probabilities for a given geometric event depending on the underlying σ-algebra (or definition of randomness!). Both Poincaré and Jaynes argued against Bertrand that there was only one acceptable solution under […]

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Why is there so much university administration? We kind of asked for it.

April 13, 2015
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The latest commentary on the rising cost of college tuition is by Paul F. Campos and is titled The Real Reason College Tuition Costs So Much. There has been much debate about this article and whether Campos is right or wrong...and I don't plan to add to that. However, I wanted to pick up on

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Conflict of interest

April 13, 2015
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Conflict of interest

Disclaimer: I'm fully aware of the obvious conflict of interest here, but also I think that this looks really good, so I'll write about it anyway.This post is to highlight that Marta's and Michela's book on Spatial and Spatio-temporal Bayesian Mod...

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Quantifying uncertainty

April 13, 2015
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The primary way to quantify uncertainty is to use probability. Subject to certain axioms that aim to capture common-sense rules for quantifying uncertainty, probability theory is essentially the only way. (This is Cox’s theorem.) Other methods, such as fuzzy logic, may be useful, though they must violate common sense (at least as defined by Cox’s theorem) […]

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Why do we communicate probability calculations so poorly, even when we know how to do it better?

April 13, 2015
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Haynes Goddard writes: I thought to do some reading in psychology on why Bayesian probability seems so counterintuitive, and making it difficult for many to learn and apply. Indeed, that is the finding of considerable research in psychology. It turns out that it is counterintuitive because of the way it is presented, following no doubt […] The post Why do we communicate probability calculations so poorly, even when we know…

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Genomics Case Studies Online Courses Start in Two Weeks (4/27)

April 13, 2015
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The last month of the HarvardX Data Analysis for Genomics series start on 4/27. We will cover case studies on RNAseq, Variant calling, ChipSeq and DNA methylation. Faculty includes Shirley Liu, Mike Love, Oliver Hoffman and the HSPH Bioinformatics Core. Although taking the previous courses on the series will help, the four case study courses

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DO loop = 1 TO 600;

April 13, 2015
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DO loop = 1 TO 600;

Today is my 600th blog post for The DO Loop. I have written about many topics that are related to statistical programming, math, statistics, simulation, numerical analysis, matrix computations, and more. The right sidebar of my blog contains a tag cloud that links to many topics. What topics do you, […]

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I still think you can manufacture an unfair coin

April 13, 2015
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In Gelman and Nolan’s paper “You Can Load a Die, But You Can’t Bias a Coin” The American Statistician, November 2002, Vol. 56, No. 4 it is argued you can’t easily produce a coin that is biased when flipped (and caught). A numb...

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a vignette on Metropolis

April 12, 2015
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a vignette on Metropolis

Over the past week, I wrote a short introduction to the Metropolis-Hastings algorithm, mostly in the style of our Introduction to Monte Carlo with R book, that is, with very little theory and worked-out illustrations on simple examples. (And partly over the Atlantic on my flight to New York and Columbia.) This vignette is intended […]

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How (Not) to Interpret That p-Value

April 12, 2015
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How (Not) to Interpret That p-Value

Thanks to my colleague, Linda Welling, for bringing this post to my attention: Still Not Significant.I just love it! (Take some of the comments with a grain of salt, though.) © 2015, David E. Giles

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Power is of two kinds (or: Gandhi, power, fear, love, and statistics)

April 12, 2015
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Power is of two kinds (or: Gandhi, power, fear, love, and statistics)

In the chapter of DBDA2E on Goals, Power, and Sample Size (p. 384), I quoted the Mahatma Gandhi:"Power is of two kinds. One is obtained by the fear of punishment and the other by arts of love. Power based on love is a thousand times more effective and ...

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Cefamandole: PK after IV with six subjects in JAGS

April 12, 2015
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Cefamandole: PK after IV with six subjects in JAGS

After last week's post on Theoph I noticed the MEMSS library contained more PK data sets. The Cefamandole data is an IV data set with six subjects. It is somewhat challenging, since there seem to be several elimination rates.DataData are displayed...

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The wings of a programmer

April 12, 2015
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The wings of a programmer

Programmers think programming is really hard.  Non-programmers think it’s even harder than that. Figure 1: The perceived difficulty of programming.  Why is programming so arduous? There are a few reasons.  Here is one. Wings Programming is exacting, programming needs creativity. These are absolutely at odds with each other. One wing wants the programmer to respect every […] The post The wings of a programmer appeared first on Burns Statistics.

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“Another bad chart for you to criticize”

April 12, 2015
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“Another bad chart for you to criticize”

Perhaps in response to my lament, “People used to send me ugly graphs, now I get these things,” Stuart Buck sends me an email with the above comment and a link to this “Graphic of the day” produced by some uncredited designer at Thomson Reuters: From a statistical perspective, this graph is a disaster in […] The post “Another bad chart for you to criticize” appeared first on Statistical Modeling,…

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Another stylized fact bites the dust

April 11, 2015
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According to economist Henry Farber (link from Dan Goldstein): In a seminal paper, Camerer, Babcock, Loewenstein, and Thaler (1997) find that the wage elasticity of daily hours of work New York City (NYC) taxi drivers is negative and conclude that their labor supply behavior is consistent with target earning (having reference dependent preferences). I replicate […] The post Another stylized fact bites the dust appeared first on Statistical Modeling, Causal…

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Summer Internship at Novartis: Stan PK/PD Modeling

April 11, 2015
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Summer Internship at Novartis:  Stan PK/PD Modeling

This looks like a great way to spend a summer: Summer Internship at Novartis Integrated Quantitative Sciences Here’s the job description: Bayesian modeling tools with Stan: Create re-usable tools for the Bayesian modeling of pharmacometrics data that can integrate diverse data sources (including pre-clinical, in-silico model predictions, etc.). Using the latest Stan’s facilities (http://mc-stan.org) develop […] The post Summer Internship at Novartis: Stan PK/PD Modeling appeared first on Statistical Modeling,…

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Modeling Categories with Breadth and Depth

April 11, 2015
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Modeling Categories with Breadth and Depth

Religion is a categorical variable with followers differentiated by their degree of devotion. Liberals and conservatives check their respective boxes when surveyed, although moderates from each group sometimes seem more alike than their more extreme co...

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Translational Bioinformatics Year In Review

April 10, 2015
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Translational Bioinformatics Year In Review

Per tradition, Russ Altman gave his "Translational Bioinformatics: The Year in Review" presentation at the close of the AMIA Joint Summit on Translational Bioinformatics in San Francisco on March 26th.  This year, papers came from six key areas (a...

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A silly little error, of the sort that I make every day

April 10, 2015
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A silly little error, of the sort that I make every day

Ummmm, running Stan, testing out a new method we have that applies EP-like ideas to perform inference with aggregate data—it’s really cool, I’ll post more on it once we’ve tried everything out and have a paper that’s in better shape—anyway, I’m starting with a normal example, a varying-intercept, varying-slope model where the intercepts have population […] The post A silly little error, of the sort that I make every day…

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