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What do Rick Santorum and Andrew Cuomo have in common?

Besides family values, that is? Both these politicians seem to have a problem with the National Weather Service: The Senator: Santorum also accused the weather service’s National Hurricane Center of flubbing its forecasts for Hurricane...Show More Summary

Princeton Abandons Grade Deflation Plan . . .

... and Kaiser Fung is unhappy. In a post entitled, “Princeton’s loss of nerve,” Kaiser writes: This development is highly regrettable, and a failure of leadership. (The new policy leaves it to individual departments to do whatever they...Show More Summary

254A, Notes 1: Elementary multiplicative number theory

In analytic number theory, an arithmetic function is simply a function from the natural numbers to the real or complex numbers. (One occasionally also considers arithmetic functions taking values in more general rings than or, as in this previous blog post, but we will restrict attention here to the classical situation of real or […]

Blogs > Twitter

Tweeting has its virtues, I’m sure. But over and over I’m seeing these blog vs. twitter battles where the blogger wins. It goes like this: blogger gives tons and tons of evidence, tweeter responds with a content-free dismissal. The most...Show More Summary

50 shades of gray goes pie-chart

Rogier Kievit sends in this under the heading, “Worst graph of the year... horribly unclear... Even the report doesn’t have a legend!”: My reply: It’s horrible but I still think the black-and-white Stroop test remains the worst visual...Show More Summary

A general parity problem obstruction

Many problems and results in analytic prime number theory can be formulated in the following general form: given a collection of (affine-)linear forms, none of which is a multiple of any other, find a number such that a certain property of the linear forms are true. For instance: For the twin prime conjecture, one […]

“If you’re not using a proper, informative prior, you’re leaving money on the table.”

Well put, Rob Weiss. This is not to say that one must always use an informative prior; oftentimes it can make sense to throw away some information for reasons of convenience. But it’s good to remember that, if you do use a noninformative...Show More Summary

Statshot: Demographics, Heart Disease and iPhone Games

This week in Statshot, demographics, heart disease and iPhone games.

Overtime, the San Francisco Housing Market and Taylor Swift (Statshot)

American workers are spending more hours on the job since the mid-1970s. San Francisco’s housing market continues to heat up. Taylor Swift’s new album “1989” just became the fastest U.S. seller since “The Eminem Show” in 2002.

An Array Of Zeroes

Beware! Today’s exercise, which derives from an interview question asked at Facebook, is trickier than it looks: You are given an array of integers. Write a program that moves all non-zero integers to the left end of the array, and all zeroes to the right end of the array. Your program should operate in place. […]

Open access, ACM and the Gates Foundation.

Matt Cutts, in an article on the new Gates Foundation open access policy (ht +Fernando Pereira) says thatwhile the ACM continues to drag its heels, the Gates Foundation has made a big move to encourage Open Access...Which got me thinking. Show More Summary

Soil Scientists Seeking Super Model

I (Bob) spent last weekend at Biosphere 2, collaborating with soil carbon biogeochemists on a “super model.” Model combination and expansion The biogeochemists (three sciences in one!) have developed hundreds of competing models andShow More Summary

Retrospective clinical trials?

Kelvin Leshabari writes: I am a young medical doctor in Africa who wondered if it is possible to have a retrospective designed randomised clinical trial and yet be sound valid in statistical sense. This is because to the best of my knowledge,...Show More Summary

Damm’s Algorithm

We studied Hans Peter Luhn’s algorithm for generating check digits in a previous exercise. Today, we look at an alternate check digit algorithm developed by H. Michael Damm. Both algorithms are useful for creating checked identification numbers, suitable for credit cards or other identity numbers. Damm’s algorithm is based on table lookup. It is initialized […]

Replication controversies

I don’t know what ATR is but I’m glad somebody is on the job of prohibiting replication catastrophe: Seriously, though, I’m on a list regarding a reproducibility project, and someone forwarded along this blog by psychology researcher...Show More Summary

4-year-old post on Arnold Zellner is oddly topical

I’m re-running this Arnold Zellner obituary because it is relevant to two recent blog discussions: 1. Differences between econometrics and statistics 2. Old-fashioned sexism (of the quaint, not the horrible, variety) The post 4-year-old post on Arnold Zellner is oddly topical appeared first on Statistical Modeling, Causal Inference, and Social Science.

Question about data mining bias in finance

Finance professor Ravi Sastry writes: Let’s say we have N vectors of data, {y_1,y_2,…,y_N}. Each is used as the dependent variable in a series of otherwise identical OLS regressions, yielding t-statistics on some parameter of interest, theta: {t_1,t_2,…,t_N}. Show More Summary

ANU hiring postdocs

Amnon Neeman has just put up an ad for two postdoctoral positions at the ANU. He says: “The successful applicants should have strong research interests and activities in or related to one of the following fields: Algebraic Geometry, Commutative Algebra, Representation Theory, Algebraic Topology, Algebraic K-Theory. Show More Summary

Quiver Grassmannians can be anything

A standard Grassmannian $Gr(m,V)$ is the manifold having as its points all possible $m$-dimensional subspaces of a given vectorspace $V$. As an example, $Gr(1,V)$ is the set of lines through the origin in $V$ and therefore is the projective space $\mathbb{P}(V)$. Grassmannians are among the nicest projective varieties, they are smooth and allow a cell […]

Stan hits bigtime

First Wikipedia, then the Times (featuring Yair Ghitza), now Slashdot (featuring Allen “PyStan” Riddell). Just get us on Gawker and we’ll have achieved total media saturation. Next step, backlash. Has Stan jumped the shark? Etc. (We’d love to have a “jump the shark” MCMC algorithm but I don’t know if or when we’ll get there. Show More Summary

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