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Panos Ipeirotis
Works at New York University
Attended Columbia University, New York, NY, USA
Lives in New York, NY, USA
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Did you know you could get bibtex directly from a doi? It's called DOI content negotiation and it can do a lot of other really cool tricks.

I don't know how to do get bibtex from the browser but this works on the command line:

curl -LH "Accept: application/x-bibtex" http://dx.doi.org/10.1007/s11083-012-9252-6

Here is the magic output:

@article{Dorais_2012,
doi = {10.1007/s11083-012-9252-6},
url = {http://dx.doi.org/10.1007/s11083-012-9252-6},
year = 2012,
month = {mar},
publisher = {Springer Science $\mathplus$ Business Media},
volume = {30},
number = {2},
pages = {415--426},
author = {Fran{\c{c}}ois Gilbert Dorais and Steven Gubkin and Daniel McDonald and Manuel Rivera},
title = {Automorphism Groups of Countably Categorical Linear Orders are Extremely Amenable},
journal = {Order}
}

http://www.crosscite.org/cn/
DOIs provide a persistent link to content. They identify many types of work, from journal articles to research data sets. Typically, someone interacting with DOIs will be a researcher, who will resolve DOIs found in scholarly references to content using a DOI resolver. Such researchers may not ...
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Demographics of Mechanical Turk: Now Live! (April 2015 edition)
One of the most common question that I receive is whether I have new data about the demographics of Mechanical Turk workers. The latest data that I had collected were back in 2010, and it was not clear how things have changed since then. The key problem was...
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CC +Peng Dai​
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The class Mining Massive Data Sets looks fantastic. Not only does it have an all-star cast (Jure Leskovec, Anand Rajaraman, Jeff Ullman), but also the production quality looks quite high and content appears to be very good (at least from the first week of lectures and the syllabus). It just started at Coursera and is free.
Mining Massive Datasets is a free online class taught by Jure Leskovec, Anand Rajaraman and Jeff Ullman of Stanford University
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that looks great, please check out Billpayadvisor.com
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Interesting hypothesis on how the way that a calculator works (yes, a calculator) can influence how you think when doing math. Worth reading till the end.
 
My 16-year-old daughter has just finished her mathematics GCSE (an exam that people in England take at that age), which means that she can now give up the subject and concentrate on other subjects that interest her more. She told me before the exams that she found functions difficult, so I gave her a bit of help with them, which was quite revealing. A standard type of question is to be given two functions and asked to compose them. So I tried out a couple of questions of that form on her. What follows is an account that won't be fully accurate in its details (because I can't remember precisely how our conversations went), but accurate enough not to be misleading. 

I began by asking her something like "If f(x) = x^2 and g(y) = y+1, then what is g(f(x))?" I thought I was making things clearer by saying that g was a function of y, so that one could substitute y=x^2 rather than substituting x=x^2. This, however, was a mistake and led to her making statements like, "Well, y must be x^2 -1," which I couldn't really do much about given that I couldn't talk about quantifiers.

Actually, I tried to talk about quantifiers without explicitly mentioning them, by saying things like "f takes any number and squares it, while g adds 1." But it didn't really help. When I gave up and said "f(x) = x^2 and g(x) = x+1," she was no longer confused, even though in some sense she ought to have been confused.

Well, I say she wasn't, but then a new problem emerged, which was that she consistently composed functions the wrong way round. So I'd ask her what g(f(x)) was when g(x)=x+1 and f(x)=x^2 and she would say (x+1)^2. I tried hard to think what could possibly be going on in her mind, which was difficult when I find the notation g(f(x)) utterly transparent: obviously you rewrite f(x) as x^2 to get g(x^2), and then since g(x) is x+1, g(x^2) must be x^2+1. But somehow she wasn't seeing it like that. 

Writing this, I now think that perhaps she read the g and thought "OK, that gives me x+1," then read the f and thought "That's x^2, so I must square the x+1," ending up with (x+1)^2. In other words, she was simply doing the functions in the order they were written. So she wasn't reading g(f(x)) as "Do g to f(x)". Rather, she was reading it as "Do g and then f to x". 

At some point in the conversation I discovered something that suddenly shed light on the situation. When I was her age, if I had been told that f(x) = sin(x+30) and had then been asked to work out f(10) on a calculator, I would have had to type in 1 0 + 3 0 = SIN. Similarly, if I had had to work out exp(sqrt(log 20)) I would have had to type in 2 0 LN SQRT EXP. But she had been issued with a calculator where you simply type in the expression as it is written on the page. So for those examples, she would have typed SIN ( 1 0 + 3 0 ) = and EXP ( SQRT ( LN 2 0 ) ) =. The result: without being conscious of it, I was internalizing the way functions worked, every time I used my calculator, while she could simply switch off her brain and copy expressions directly from the page, with no need to consider what they meant. This calculator, by the way, is the standard one that everyone in the country taking the exam is supposed to use.

The end of the story is that she did in the end get the idea and did her functions questions without any problem. So this post is not about her but about the way she, and presumably hundreds of thousands of others, have been taught mathematics.
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My Peer Grading Scheme
One of the components that I use in my class is student presentations.  While I like having students present, I had always a hard time grading the presentations. Plus, many students seemed to target the presentation to me, trying to sound too technical and ...
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Very nice !!
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LED-lit solar panel roads could power all of our electricity needs.

Learn more: goo.gl/ahTJa9
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At http://demographics.mturk-tracker.com/ we now show live results of Mechanical Turk demographics surveys.
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Very interesting! At all interested in some help API-enabling the anonymized data?
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Εμείς φτάναμε φέτος στο 75%+ χωρίς αφυγραντήρα.. ενώ με αφυγραντήρα στο ~62%
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Soliciting truthful reports, while preserving anonymity:

A school wanted to ask students if they have ever taken drugs (yes or no). The survey was anonymous, but school was still worried that students will not report drug use.

So they introduced randomness to help. Each student was asked to flip a coin (privately) before answering. Heads, the student would have to say "yes". Tails, they would have to say the truth.

So, students could safely select “yes, I have taken drugs” and even if personally identified, the answer could be justified as the coin telling them to do so.

If no one had been taking drugs, 50% of the final result would be positive for drug use (those who got heads), and 50% would be negative (those who got tails).

In practice, it was something closer to 60%-40%, which meant about 20% of students had been taking drugs.
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While it's clear from what Chris Ferrie says that the idea wasn't original to me, I proposed it in a blog post once as a mechanism for having secret ballots in parliament while retaining a party system. The aim was to allow people to vote on issues on their merits without incurring the wrath of the party if they go against the party line, while not allowing them to do something like pretending to belong to one party while secretly always voting against it. The idea is that your voting record would be made public, except that each vote would have a certain probability, such as 10%, of being switched the other way. Then consistent anti-party voting would be detectable, but not the occasional rebellion.
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Importing Web Data into Google Spreadsheet

Did you know you can import tables available online directly into +Google Drive? That can be done using the ImportHTML function on  Google Spreadsheets and will save you a lot of time. The image below shows how to do it (source goo.gl/19mojE).
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The panorama stitching + HDR was done automatically by Google, after uploading my raw images in Google Drive. I am getting increasingly impressed by the features that are silently introduced by Google in its products.
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omg!
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"In the United States you have shareholder capitalism, in which shareholders will pressure a company for short-term profits. Japan and Germany have a stakeholder system, which lets companies invest in workers who are better trained, more loyal and more informed."
From a department store's elaborate welcoming rituals to a hotel's nearly uncanny sense of its guests' needs, one writer explores the Land of the Rising Sun's comprehensive service culture.
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Work
Occupation
Associate Professor
Employment
  • New York University
    Associate Professor, 2004 - present
  • Computer Technology Institute, Patras, Greece
  • Columbia University, New York, NY, USA
    1999 - 2004
  • Microsoft Research, Cambridge, UK
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
New York, NY, USA
Previously
Greece - Serres, Greece - Patras, Greece - New York, NY, USA - Cambridge, UK
Contact Information
Work
Phone
+1-212-998-0803
Email
Address
44 West 4th Street, Ste 8-84New York, NY 10012
Story
Introduction
Panos Ipeirotis is an Associate Professor and George A. Kellner Faculty Fellow at the Department of Information, Operations, and Management Sciences at Leonard N. Stern School of Business of New York University.
Education
  • Columbia University, New York, NY, USA
  • University of Patras, Greece
Basic Information
Gender
Male
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Panos Ipeirotis's +1's are the things they like, agree with, or want to recommend.
word2vec
code.google.com

Tool for computing continuous distributed representations of words.

Interview: Kenta Goto - Gear Patrol
feedproxy.google.com

We chat with Kenta Goto, head bartender at New York's famed Pegu Club and winner of the "American Bartender of the Year" award from Tales of

Glassdoor – an inside look at jobs & companies
www.glassdoor.com

Search jobs then look inside. Company salaries, reviews, interview questions, and more - all posted anonymously by employees and job seekers

AdBlock - Chrome Web Store
chrome.google.com

The most popular Chrome extension, with over 2 million users! Blocks ads all over the web.

Welcome Numero 28 pizzeria
www.numero28.com

Welcome to Numero 28 - voted the “Best Pizza in New York” by Citysearch.com readers. We specialize in authentic Neapolitan pizza, baked hot

Amy's Bread | www.amysbread.com | Welcome
www.amysbread.com

Amy's Bread - Welcome! We're very proud of our bakery and our breads. We invite you to step into our cyber-

Fake Foster Provost (FakeFoster) on Twitter
twitter.com

Fake Foster Provost (FakeFoster) is on Twitter. Sign up for Twitter to follow Fake Foster Provost (FakeFoster) and get their latest updates

NYU expansion is insult and injury to the Village
www.nydailynews.com

Doctorow: This is the familiar story of a corporation versus people. New York University has morphed into a corporation.

Puzzling outcomes in A/B testing
glinden.blogspot.com

We present ... puzzling outcomes of controlled experiments that we analyzed deeply to understand and explain ... [requiring] months to prope

The oDesk Flower: Playing with Visualizations
www.behind-the-enemy-lines.com

In the few couple of weeks, while at oDesk, I am trying to learn the data stored in the database, and I create random plots to understand wh

Big Data, Stupid Decisions / Strata Jumpstart 2011 / Panos Ipeiroti...
www.slideshare.net

Strata Jumpstart, New York, September 19 2011 Big Data , Stupid Decisions: The Importance Of Measuring What We Should Be Measuring Video

Library of Congress Home
www.loc.gov

The Library of Congress. The Library of Congress is the nation's oldest federal cultural institution, and it serves as the research arm of C

Humans Plus Computers Equals Better Crowdsourcing - BusinessWeek
www.businessweek.com

Greek-born computer scientist Panagiotis Ipeirotis is developing technology that gets computers to help people work smarter, and vice versa

Food: Very GoodService: Very GoodDecor: Good
Public - 7 years ago
reviewed 7 years ago
Food: Very GoodService: Very GoodDecor: Good
Public - 9 years ago
reviewed 9 years ago
just go there for the crepes!
Decor: Very GoodFood: ExcellentService: Very Good
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reviewed 9 years ago
Decor: GoodFood: Very GoodService: Very Good
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reviewed 9 years ago
18 reviews
Map
Map
Map
Facilities: GoodQuality: Very GoodService: Excellent
Public - 9 years ago
reviewed 9 years ago
Food: Very GoodService: GoodDecor: Very Good
Public - 9 years ago
reviewed 9 years ago
Food: Very GoodService: GoodDecor: Very Good
Public - 9 years ago
reviewed 9 years ago