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Powerset

Sets are ubiquitous in programming; we have discussed sets in several previous exercises. One of the operations that can be performed on a set is to compute its powerset, which is a set of all the subsets of the original set. For instance, the powerset of (1 2 3) is the set (() (1) (2) […]

Gaps between primes

Just a short post here to note that the cover story of this month’s Notices of the AMS, by John Friedlander, is about the recent work on bounded gaps between primes by Zhang, Maynard, our own Polymath project, and others. I may as well take this opportunity to upload some slides of my own talks […]

Discreteland and Continuousland

Roy Mendelssohn points me to this paper by Jianqing Fan, Qi-Man Shao, and Wen-Xin Zhou, “Are Discoveries Spurious? Distributions of Maximum Spurious Correlations and Their Applications.” I never know what to think about these thingsShow More Summary

On deck this week

Mon: Discreteland and Continuousland Tues: “There are many studies showing...” Wed: An Excel add-in for regression analysis Thurs: Unreplicable Fri: Economists betting on replication Sat: Inauthentic leadership? Development and validation...Show More Summary

“Menstrual Cycle Phase Does Not Predict Political Conservatism”

Someone pointed me to this article by Isabel Scott and Nicholas Pound: Recent authors have reported a relationship between women’s fertility status, as indexed by menstrual cycle phase, and conservatism in moral, social and political values. Show More Summary

On the different stages of learning and teaching (algorithms)

Descending a rabbit hole of links prompted by a MeFi discussion (thanks, +David Eppstein) of Steven Pinker's essay on the curse of knowledge (thanks, +Jeff Erickson), I came across an article by Alistair Cockburn on a learning framework...Show More Summary

July 4th

Lucky to have been born an American. The post July 4th appeared first on Statistical Modeling, Causal Inference, and Social Science.

“Why should anyone believe that? Why does it make sense to model a series of astronomical events as though they were spins of a roulette wheel in Vegas?”

Deborah Mayo points us to a post by Stephen Senn discussing various aspects of induction and statistics, including the famous example of estimating the probability the sun will rise tomorrow. Senn correctly slams a journalistic account...Show More Summary

Assign Y

I’m sorry I missed Tuesday’s exercise; I’ve been very busy at work. Today’s exercise is an interview question of the kind I don’t like: it’s tricky, you either know the answer or you don’t, and it’s unlikely to be useful in any real programming situation: You are give four integers x, y, a and b. […]

Humility needed in decision-making

Brian MacGillivray and Nick Pidgeon write: The post Humility needed in decision-making appeared first on Statistical Modeling, Causal Inference, and Social Science.

Installing Spark with Hadoop 2 using spark-ec2

YARN does not seem to be configured correctly when you use the spark-ec2 script to install a Spark cluster on EC2. Here’s my short workaround for getting YARN to work (with a simple python script at the bottom): launch a cluster with e.g. spark-ec2 -k -i -s --instance-type= --placementgroup= --hadoop-major-version=2 --copy-aws-credentials launch […]

Recently in the sister blog

When is the death penalty okay? A court with no Protestants How much does advertising matter in presidential elections? Bartenders are Democrats, beer wholesalers are Republicans The ambiguity of racial categories No, public opinionShow More Summary

Number of the Day: 1

Today's number, 1, comes courtesy of the leap second.

Where does Mister P draw the line?

Bill Harris writes: Mr. P is pretty impressive, but I’m not sure how far to push him in particular and MLM [multilevel modeling] in general. Mr. P and MLM certainly seem to do well with problems such as eight schools, radon, or the Xbox survey. Show More Summary

Hey, this is what Michael Lacour should’ve done when they asked him for his data

Texas Town Is Charging Us $79,000 for Emails About Pool Party Abuse Cop. FOIA that, pal! The post Hey, this is what Michael Lacour should’ve done when they asked him for his data appeared first on Statistical Modeling, Causal Inference, and Social Science.

What is a Reedy Category?

A new preprint explains Reedy categories from a category-theoretic point of view, as certain iterated collages of profunctor diagrams.

A note from John Lott

The other day, I wrote: It’s been nearly 20 years since the last time there was a high-profile report of a social science survey that turned out to be undocumented. I’m referring to the case of John Lott, who said he did a survey onShow More Summary

Introducing StataStan

Thanks to Robert Grant, we now have a Stata interface! For more details, see: Robert Grant’s Blog:   Introducing StataStan Jonah and Ben have already kicked the tires, and it works. We’ll be working on it more as time goes on as part...Show More Summary

God is in every leaf of every probability puzzle

Radford shared with us this probability puzzle of his from 1999: A couple you’ve just met invite you over to dinner, saying “come by around 5pm, and we can talk for a while before our three kids come home from school at 6pm”. You arrive at the appointed time, and are invited into the house. Show More Summary

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