A Sensitive Approach to Risk and Screening

January 15, 2015
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A Sensitive Approach to Risk and Screening

Risk is an important topic In order to make informed decisions about screening and medical interventions, people need to have a good understanding of risk and probability. The communication and understanding of risk was a very popular topic at the … Continue reading →

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A Sensitive Approach to Risk and Screening

January 15, 2015
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A Sensitive Approach to Risk and Screening

Risk is an important topic In order to make informed decisions about screening and medical interventions, people need to have a good understanding of risk and probability. The communication and understanding of risk was a very popular topic at the … Continue reading →

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The bracket!

January 15, 2015
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The bracket!

That’s right, we’re getting ready for the battle to choose the ultimate seminar speaker. Paul Davidson, who sent in the image below, writes: Knocked together in Excel. I’m European, so I may not have respected the North American system for brackets i.e. I split each category into seeded pools and randomly drew from them. The […] The post The bracket! appeared first on Statistical Modeling, Causal Inference, and Social Science.

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How to find the science paper behind a headline when the link is missing

January 15, 2015
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How to find the science paper behind a headline when the link is missing

I just saw a pretty wild statistic on Twitter that less than 60% of university news releases link to the papers they are describing.   Amazingly, less than 60% of university news releases link to the papers they're describing http://t.co/daN11xYvKs pic.twitter.com/QtneZUAeFD — Justin Wolfers (@JustinWolfers) January 15, 2015 Before you believe anything your read about

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I need your help in setting up the ultimate bracket: Picking the ideal seminar speaker

January 15, 2015
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I need your help in setting up the ultimate bracket:  Picking the ideal seminar speaker

This came in the departmental email awhile ago: CALL FOR APPLICATIONS: LATOUR SEMINAR — DUE DATE AUGUST 11 (extended) The Brown Institute for Media Innovation, Alliance (Columbia University, École Polytechnique, Sciences Po, and Panthéon-Sorbonne University), The Center for Science and Society, and The Faculty of Arts and Sciences are proud to present BRUNO LATOUR AT […] The post I need your help in setting up the ultimate bracket: Picking the…

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New Toy: SAS® University Edition

January 15, 2015
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New Toy: SAS® University Edition

So I started using SAS® University Edition which is a FREE version of SAS® software. Again it's FREE, and that's the main reason why I want to relearn the language. The software was announced on March 24, 2014 and the download went available on May of that year. And for that, I salute Dr. Jim Goodnight. At least we can learn SAS® without paying for the expensive price tag, especially…

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Stan comes through . . . again!

January 14, 2015
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Stan comes through . . . again!

Erikson Kaszubowski writes in: I missed your call for Stan research stories, but the recent post about stranded dolphins mentioned it again. When I read about the Crowdstorming project in your blog, I thought it would be a good project to apply my recent studies in Bayesian modeling. The project coordinators shared a big dataset […] The post Stan comes through . . . again! appeared first on Statistical Modeling,…

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Links: 2014 News Graphics Round-Ups

January 14, 2015
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In the past, it used to be difficult to find news graphics from the main news organizations. In the last few years, they have started to post year-end lists of their work, which are always a treat to walk through. With the new year a few weeks behind us, this is a good time to … Continue reading Links: 2014 News Graphics Round-Ups

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Some art so far

January 14, 2015
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Some art so far

In response to my request #1 (“Gone Fishing” T-shirt), Ed Witt sent in this: I thanked Ed and asked if it would be possible to take the image and add to it so it’s clear that the “.05” is being drawn from a sea of other numbers, also with a little bucket next to the […] The post Some art so far appeared first on Statistical Modeling, Causal Inference, and…

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Using the microbenchmark package to compare the execution time of R expressions

January 14, 2015
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Using the microbenchmark package to compare the execution time of R expressions

I recently learned about the microbenchmark package while browsing through Hadley’s advanced R programming book. I’ve done some quick benchmarking using system.time() in a for loop and taking the average, but the microbenchmark function in the micr...

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Calling a global statement inside a loop

January 14, 2015
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Calling a global statement inside a loop

The other day I was creating some histograms inside a loop in PROC IML. It was difficult for me to determine which histogram was associated with which value of the looping variable. "No problem," I said. "I'll just use a TITLE statement inside the loop so that each histogram has […]

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simulation by inverse cdf

January 13, 2015
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simulation by inverse cdf

Another Cross Validated forum question that led me to an interesting (?) reconsideration of certitudes! When simulating from a normal distribution, is Box-Muller algorithm better or worse than using the inverse cdf transform? My first reaction was to state that Box-Muller was exact while the inverse cdf relied on the coding of the inverse cdf, like […]

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Why you need a second pair of eyes

January 13, 2015
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Why you need a second pair of eyes

Reader Aaron K. submitted an infographic advertising the upcoming New England Auto Show to be held in Boston (link). As Aaron pointed out, there is plenty of elementary errors contained in one page. I don't think the designer did these...

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Artist needed!

January 13, 2015
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We have some great ideas but none of us can draw. We need your help with designs and art for any or all of these projects: 1. “Gone Fishing” T-shirt A person is standing in a boat, fishing. The lake is full, not of fish but of little numbers: “.14″, “.31″, “.08″, etc etc. And […] The post Artist needed! appeared first on Statistical Modeling, Causal Inference, and Social Science.

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r4stats.com 2014 in review

January 13, 2015
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r4stats.com 2014 in review

The WordPress.com stats helper monkeys prepared a 2014 annual report for this blog. Here’s an excerpt: The Louvre Museum has 8.5 million visitors per year. This blog was viewed about 260,000 times in 2014. If it were an exhibit at … Continue reading →

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Extended Kalman filter example in R

January 13, 2015
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Extended Kalman filter example in R

Last week's post about the Kalman filter focused on the derivation of the algorithm. Today I will continue with the extended Kalman filter (EKF) that can deal also with nonlinearities. According to Wikipedia the EKF has been considered the de facto sta...

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No-go zones?

January 12, 2015
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No-go zones?

I think this is really serious: that's the story of an "expert" on terrorism, who's commented on Fox News about the situation in Europe. If you really want to laugh about it, you just take this at face value, as, erm, let's just say, "somebody" who jus...

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Trifacta revisited: tackling a Big Data problem

January 12, 2015
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During my vacation, I had a chance to visit Trifacta, the data-wrangling startup I blogged about last year (link). Wei Zheng, Tye Rattenbury, and Will Davis hosted me, and showed some of the new stuff they are working on. Trifacta is tackling a major Big Data problem, and I remain excited about the direction they are heading. From the beginning, I am attracted by Trifacta’s user interface. The user in…

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What’s misleading about the phrase, “Statistical significance is not the same as practical significance”

January 12, 2015
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You’ve heard it a million times, the idea is that if you have an estimate of .003 (on some reasonable scale in which 1 is a meaningful effect size) and a standard error of .001 then, yes, the estimate is statistically significant but it’s not practically significant. And, indeed, sometimes this sort of thing comes […] The post What’s misleading about the phrase, “Statistical significance is not the same as…

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Statistics and R for the Life Sciences: New HarvardX course starts January 19

January 12, 2015
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Statistics and R for the Life Sciences: New HarvardX course starts January 19

The first course of our Biomedical Data Science online curriculum starts next week. You can sign up here. Instead of relying on mathematical formulas to teach statistical concepts, students can program along as we show computer code for simulations that illustrate the main ideas of exploratory data analysis and statistical inference (p-values, confidence intervals and

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On deck this week

January 12, 2015
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Mon: What’s misleading about the phrase, “Statistical significance is not the same as practical significance” Tues: Artist needed! Wed: Stan comes through . . . again! Thurs: I need your help in setting up the ultimate bracket: Picking the ideal seminar speaker Fri: When a study fails to replicate: let’s be fair and open-minded Sat: […] The post On deck this week appeared first on Statistical Modeling, Causal Inference, and…

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Twelve posts from 2014 that deserve a second look

January 12, 2015
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Twelve posts from 2014 that deserve a second look

I began 2015 by compiling a list of popular articles from my blog in 2014. Although this "People's Choice" list contains many interesting articles, some of my favorites did not make the list. Today I present the "Editor's Choice" list of articles that deserve a second look. I've highlighted one […]

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“Only those samples which fit the model best in cross validation were included” (whistleblower) “I suspect that we likely disagree with what constitutes validation” (Potti and Nevins)

January 12, 2015
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“Only those samples which fit the model best in cross validation were included” (whistleblower) “I suspect that we likely disagree with what constitutes validation” (Potti and Nevins)

So it turns out there was an internal whistleblower in the Potti scandal at Duke after all (despite denials by the Duke researchers involved ). It was a medical student Brad Perez. It’s in the Jan. 9, 2015 Cancer Letter*. Ever since my first post on Potti last May (part 1), I’ve received various e-mails and phone calls from people wishing to confide their inside […]

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