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Find total execution time of the program ??

A CPU has a five-stage pipeline and runs at 1 GHz frequency. Instruction fetch happens in the first stage of the pipeline. A conditional branch instruction computes the target address and evaluates the condition in the third stage of the pipeline. Show More Summary

Streaming @ SODA: Part II

This is the second of two posts by Samira Daruki on the streaming sessions at SODA 2015. For the first post, see here. In the third paper from the streaming graph family in SODA15: "Parameterized Streaming: Maximal Matching and Vertex...Show More Summary

About a zillion people pointed me to yesterday’s xkcd cartoon

I have the same problem with Bayes factors, for example this: and this: (which I copied from Wikipedia, except that, unlike you-know-who, I didn’t change the n’s to d’s and remove the superscripting). Either way, I don’t buy the numbers, and I certainly don’t buy the words that go with them. Show More Summary

Crowdsourcing data analysis: Do soccer referees give more red cards to dark skin toned players?

Raphael Silberzahn Eric Luis Uhlmann Dan Martin Pasquale Anselmi Frederik Aust Eli Christopher Awtrey Št?pán Bahník Feng Bai Colin Bannard Evelina Bonnier Rickard Carlsson Felix Cheung Garret Christensen Russ Clay Maureen A. Craig Anna Dalla Rosa Lammertjan Dam Mathew H. Show More Summary

Number of the Day: 123

The national average price of a gallon of regular gasoline is a half-cent higher today than yesterday. That ends a record streak of 123 consecutive declines.

“It is perhaps merely an accident of history that skeptics and subjectivists alike strain on the gnat of the prior distribution while swallowing the camel that is the likelihood”

I recently bumped into this 2013 paper by Christian Robert and myself, “‘Not Only Defended But Also Applied': The Perceived Absurdity of Bayesian Inference,” which begins: Younger readers of this journal may not be fully aware of the passionate battles over Bayesian inference among statisticians in the last half of the twentieth century. Show More Summary

Sum Of Four Primes

Today’s exercise comes from one of those competitive programming websites. I never participate in the coding frenzy at those sites, because the competitiveness at extracting every last millisecond from the run time or deleting every unneeded character from the program text ruins the pleasure, but some of the problems are fun: Given a positive integer […]

Streaming @ SODA: Part I

This two part series is written by my student Samira Daruki. Modern graph data sets are too large to fit in the memory. And so the streaming model is one of the more popular and attractive ones for analyzing massive graphs: in this model,...Show More Summary

“The Statistical Crisis in Science”: My talk this Thurs at the Harvard psychology department

It’s noon Thursday, January 29, 2015, in William James Hall 765: The Statistical Crisis in Science Andrew Gelman, Dept of Statistics and Dept of Political Science, Columbia University Top journals in psychology routinely publish ridiculous,...Show More Summary

Number of the Day: 1,000

Duke University men's basketball coach Mike Krzyzewski scored his 1,000th career victory Sunday. That's no small feat.

The (hypothetical) phase diagram of a statistical or computational method

So here’s the deal. You have a new idea, call it method C, and you try it out on problems X, Y, and Z and it works well—it destroys the existing methods A and B. And then you publish a paper with the pithy title, Method C Wins. And,Show More Summary

On deck this week

Mon: The (hypothetical) phase diagram of a statistical or computational method Tues: “It is perhaps merely an accident of history that skeptics and subjectivists alike strain on the gnat of the prior distribution while swallowing the...Show More Summary

Tell me what you don’t know

We’ll ask an expert, or even a student, to “tell me what you know” about some topic. But now I’m thinking it makes more sense to ask people to tell us what they don’t know. Why? Consider your understanding of a particular topic to be divided into three parts: 1. Show More Summary

Postdoc opportunity here, with us (Jennifer Hill, Marc Scott, and me)! On quantitative education research!!

Hop the Q-TRAIN: that is, the Quantitative Training Program, a postdoctoral research program supervised by Jennifer Hill, Marc Scott, and myself, and funded by the Institute for Education Sciences. As many of you are aware, education research is both important and challenging. Show More Summary

“What then should we teach about hypothesis testing?”

Someone who wishes to remain anonymous writes in: Last week, I was looking forward to a blog post titled “Why continue to teach and use hypothesis testing?” I presume that this scheduled post merely became preempted by more timely posts. Show More Summary

Behind the Benchmarks: A Look at Some Crude History

Crude oil was once traded with no public point of reference. Now oil benchmarks such as West Texas Intermediate and Brent are readily available. And they're telling different stories.

Number of the Day: ’529?

The hubbub over whether to begin taxing '529' college-savings accounts raises a question of how to define the middle class

What’s the point of the margin of error?

So... the scheduled debate on using margin of error with non-probability panels never happened. We got it started but there was some problem with the webinar software and nobody put the participants could hear anything. The 5 minutes of conversation we did have was pretty good, though. Show More Summary

Fibonacci Conjecture

The sequence of Fibonacci numbers is defined as F0 = 0, F1 = 1, Fn = Fn?2 + Fn?1. It has been conjectured that for any Fibonacci number F, F2 + 41 is composite. Your task is to either prove the conjecture to be true or find a counter-example that demonstrates it is false (hint: […]

Reader Mailbag: Second-Guessing on Leap Seconds

Numbers readers took some issue with the notion that, if left unadjusted over a few centuries, the disparity between atomic clocks and time based on the rotation of the Earth would gradually increase after a few centuries to a full hour. Show More Summary

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