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. His recent research interests focus on crowdsourcing and on mining user-generated content on the Internet. He received his Ph.D. degree in Computer Science from Columbia University in 2004. He has received four “Best Paper” awards (IEEE ICDE 2005, ACM SIGMOD 2006, WWW 2011, ICIS 2012), two “Best Paper Runner Up” awards (JCDL 2002, ACM KDD 2008), and is also a recipient of a CAREER award from the National Science Foundation and of several other grants.
Jan 2011
Unrefereed
Managing Crowdsourcing Workers • Jing Wang, Panagiotis G. Ipeirotis, and Foster Provost • Winter Conference on Business Intelligence, 2011
Dec 2010
Unrefereed
Modeling Dependency in Prediction Markets • Nikolay Archak and Panagiotis G. Ipeirotis • NYU Center for Digital Economy Research Working Paper No. CEDER-10-05
Mar 2010
Unrefereed
Demographics of Mechanical Turk • Panagiotis G. Ipeirotis • NYU Center for Digital Economy Research Working Paper CeDER-10-01
Mar 2009
Unrefereed
The Dimensions of Reputation in Electronic Markets • Anindya Ghose, Panagiotis G. Ipeirotis, and Arun Sundararajan • NYU Center for Digital Economy Research Working Paper No. CeDER-06-02
Feb 2013
Refereed
Repeated Labeling Using Multiple Noisy Labelers • Panagiotis G. Ipeirotis, Foster Provost, Victor S. Sheng, and Jing Wang • Data Mining and Knowledge Discovery
Jan 2013
Refereed
Facilitating Document Annotation using Content and Querying Value • Eduardo J. Ruiz, Vagelis Hristidis, and Panagiotis G. Ipeirotis • IEEE Transactions on Knowledge and Data Engineering (TKDE)
May 2012
Refereed
Designing Ranking Systems for Hotels on Travel Search Engines by Mining User-Generated and Crowd-Sourced Content • Anindya Ghose, Panagiotis G. Ipeirotis, and Beibei Li • Marketing Science, Vol. 31, No. 3, May/June 2012
Feb 2012
Refereed
Answering General Time-Sensitive Queries • Wisam Dakka, Luis Gravano, and Panagiotis G. Ipeirotis • IEEE Transactions on Knowledge and Data Engineering (TKDE), Vol. 24, No. 2, February 2012
Oct 2011
Refereed
Relevance-Based Retrieval on Hidden-Web Text Databases without Ranking Support • Vagelis Hristidis, Yuheng Hu, and Panagiotis G. Ipeirotis • IEEE Transactions on Knowledge and Data Engineering (TKDE), Vol. 23, No. 10, October 2011
Oct 2011
Refereed
Estimating the Helpfulness and Economic Impact of Product Reviews: Mining Text and Reviewer Characteristics • Anindya Ghose and Panagiotis G. Ipeirotis • IEEE Transactions on Knowledge and Data Engineering (TKDE), Vol. 23, No. 10, October 2011
Aug 2011
Refereed
Deriving the Pricing Power of Product Features by Mining Consumer Reviews • Nikolay Archak, Anindya Ghose, and Panagiotis G. Ipeirotis • Management Science, Vol. 57, No 8, August 2011
Dec 2010
Refereed
Analyzing the Amazon Mechanical Turk Marketplace • Panagiotis G. Ipeirotis • ACM XRDS (Crossroads), Vol. 17, No 2, Winter 2010
Aug 2010
Refereed
Running Experiments on Amazon Mechanical Turk • Gabriele Paolacci, Jesse Chandler, and Panagiotis G. Ipeirotis • Judgment and Decision Making, Vol. 5, No. 5, August 2010
Apr 2009
Refereed
A Quality-Aware Optimizer for Information Extraction • Alpa Jain and Panagiotis G. Ipeirotis • ACM Transactions on Database Systems (TODS), Vol. 34, No. 1, April 2009
Mar 2009
Refereed
The EconoMining Project at NYU: Studying the Economic Value of User-Generated Content on the Internet • Anindya Ghose and Panagiotis G. Ipeirotis • Journal of Revenue and Pricing Management, Vol. 8, No 2-3, March 2009
Dec 2008
Invited
Building Query Optimizers for Information Extraction: The SQoUT Project • Alpa Jain, Panagiotis G. Ipeirotis, and Luis Gravano • SIGMOD Record, Special Issue on "Managing Information Extraction," Vol. 37, No. 4, December 2008
Mar 2008
Invited
Classification-Aware Hidden-Web Text Database Selection • Panagiotis G. Ipeirotis and Luis Gravano • ACM Transactions on Information Systems (TOIS), Vol. 26, No. 2, March 2008
Nov 2007
Refereed
Towards a Query Optimizer for Text-Centric Tasks • Panagiotis G. Ipeirotis, Eugene Agichtein, Pranay Jain, and Luis Gravano • ACM Transactions on Database Systems (TODS), Vol. 32, No. 4, November 2007
Aug 2007
Refereed
Modeling and Managing Changes in Text Databases • Panagiotis G. Ipeirotis, Alexandros Ntoulas, Junghoo Cho, and Luis Gravano • ACM Transactions on Database Systems (TODS), Vol. 32, No. 3, August 2007
Jan 2007
Refereed
Duplicate Record Detection: A Survey • Ahmed K. Elmagarmid, Panagiotis G. Ipeirotis, and Vassilios S. Verykios • IEEE Transactions on Knowledge and Data Engineering (TKDE), Vol. 19, No. 1, January 2007
Jan 2003
Refereed
QProber: A System for Automatic Classification of Hidden-Web Databases • Luis Gravano, Panagiotis G. Ipeirotis, and Mehran Sahami • ACM Transactions on Information Systems (TOIS), Vol. 21, No. 1, January 2003
Mar 2002
Invited
Query- vs. Crawling-Based Classification of Searchable Web Databases • Luis Gravano, Panagiotis G. Ipeirotis, and Mehran Sahami • IEEE Data Engineering Bulletin, Vol. 25, No. 1, March 2002
Dec 2001
Invited
Using q-grams in a DBMS for Approximate String Processing • Luis Gravano, Panagiotis G. Ipeirotis, Hosagrahar Visvesvaraya Jagadish, Nick Koudas, Shanmugauelayut Muthukrishnan, Lauri Pietarinen, and Divesh Srivastava • IEEE Data Engineering Bulletin, Vol. 24, No. 4, December 2001
Feb 2013
Refereed
Have you Done Anything Like That? Predicting Performance Using Inter-category Reputation • Marios Kokkodis and Panagiotis G. Ipeirotis • Sixth International Conference on Web Search and Data Mining (WSDM 2013) • 73/387=19% accepted
Dec 2012
Refereed
Bonus, Disclosure, and Choice: What Motivates the Creation of High-Quality Paid Reviews? • Jing Wang, Anindya Ghose, and Panagiotis G., Ipeirotis • Thirty Third International Conference on Information Systems (ICIS 2012)
Dec 2012
Refereed
Search Less, Find More? Examining Limited Consumer Search with Social Media and Product Search Engines • Anindya Ghose, Panagiotis G. Ipeirotis, and Beibei Li • Thirty Third International Conference on Information Systems (ICIS 2012) • Best Theme Paper Award
Dec 2011
Refereed
Content and Context: Identifying the Impact of Qualitative Information on Consumer Choice • Sinan Aral, Panagiotis G. Ipeirotis, and Sean Taylor • Proceedings of the International Conference on Information Systems (ICIS), 2011
Mar 2011
Refereed
Towards a Theory Model for Product Search • Beibei Li, Anindya Ghose, and Panagiotis G. Ipeirotis • Proceedings of the 20th International World-Wide Web Conference (WWW), 2011 • 81/658=12% accepted; Best Paper Award
Mar 2010
Refereed
Ranked Queries Over Sources with Boolean Query Interfaces without Ranking Support • Vagelis Hristidis, Yuheng Hu, and Panagiotis G. Ipeirotis • Proceedings of the 25th IEEE International Conference on Data Engineering (ICDE), 2010 • ~20% accepted
Jan 2010
Refereed
Designing Ranking Systems for Hotels on Travel Search Engines to Enhance User Experience • Anindya Ghose, Panagiotis G. Ipeirotis, and Beibei Li • Proceedings of the International Conference on Information Systems (ICIS), 2010
Jul 2009
Refereed
Modeling Volatility in Prediction Markets • Nikolay Archak and Panagiotis G. Ipeirotis • Proceedings for the 10th ACM Conference on Electronic Commerce (EC), 2009 • 40/158 = 25% accepted
Mar 2009
Refereed
Join Optimization of Information Extraction Output: Quality Matters! • Alpa Jain, Panagiotis G. Ipeirotis, An-Hai Doan, and Luis Gravano • Proceedings of the 25th IEEE International Conference on Data Engineering (ICDE), 2009 • 93/554 = 16.7% accepted
Feb 2009
Refereed
Query by Document • Yin Yang, Nilesh Bansal, Wisam Dakka, Panagiotis G. Ipeirotis, Nick Koudas, and Dimitris Papadias • Proceedings of the Second ACM International Conference on Web Search and Data Mining (WSDM), 2009 • 29/170 = 17% accepted
Aug 2008
Refereed
Get Another Label? Improving Data Quality and Data Mining Using Multiple, Noisy Labelers • Victor S. Sheng, Foster Provost, and Panagiotis G. Ipeirotis • Proceedings of the Fourteenth ACM International Conference on Knowledge Discovery and Data Mining (KDD), 2008 • 50/~500 < 10% accepted; Best Paper Award Runner Up
Apr 2008
Refereed
Automatic Extraction of Useful Facet Hierarchies from Text Databases • Wisam Dakka and Panagiotis G. Ipeirotis • Proceedings of the 24th IEEE International Conference on Data Engineering (ICDE), 2008 • 75/617 = 12.1% accepted
Aug 2007
Refereed
Designing Novel Review Ranking Systems: Predicting Usefulness and Impact of Reviews • Anindya Ghose and Panagiotis G. Ipeirotis • Proceedings of the Ninth International Conference on Electronic Commerce (ICEC), 2007
Aug 2007
Refereed
Show me the Money! Deriving the Pricing Power of Product Features by Mining Consumer Reviews • Nikolay Archak, Anindya Ghose, and Panagiotis G. Ipeirotis • Proceedings of the Thirteenth ACM International Conference on Knowledge Discovery and Data Mining (KDD), 2007 • ~100/513 < 20% accepted
Jun 2007
Refereed
Opinion Mining Using Econometrics: A Case Study on Reputation Systems • Anindya Ghose, Panagiotis G. Ipeirotis, and Arun Sundararajan • Proceedings of the 45th Annual Meeting of the Association for Computational Linguistics (ACL), 2007 • 132/588 = 22% accepted
Jun 2006
Refereed
To Search or to Crawl? Towards a Query Optimizer for Text-Centric Tasks • Panagiotis G. Ipeirotis, Eugene Agichtein, Pranay Jain, and Luis Gravano • Proceedings of the 2006 ACM International Conference on Management of Data (SIGMOD), 2006 • 58/446=13% accepted; Best Paper Award
Oct 2005
Refereed
Automatic Construction of Multifaceted Browsing Interfaces • Wisam Dakka, Panagiotis G. Ipeirotis, and Kenneth R. Wood • Proceedings of the 2005 ACM International Conference on Information and Knowledge Management (CIKM), 2005 • 76/425 = 18% accepted
Apr 2005
Refereed
Modeling and Managing Content Changes in Text Databases • Panagiotis G. Ipeirotis, Alexandros Ntoulas, Junghoo Cho, and Luis Gravano • Proceedings of the 21st IEEE International Conference on Data Engineering (ICDE), 2005 • 67/521 = 13% accepted; Best Paper Award
Jun 2004
Refereed
When one Sample is not Enough: Improving Text Database Selection Using Shrinkage • Panagiotis G. Ipeirotis and Luis Gravano • Proceedings of the 2004 ACM International Conference on Management of Data (SIGMOD), 2004 • 69/431 = 16% accepted
May 2003
Refereed
Text Joins in an RDBMS for Web Data Integration • Luis Gravano, Panagiotis G. Ipeirotis, Nick Koudas, and Divesh Srivastava • Proceedings of the 12th International World-Wide Web Conference (WWW), 2003 • 13% accepted, more than 600 submissions
Mar 2003
Refereed
Text Joins for Data Cleansing and Integration in an RDBMS • Luis Gravano, Panagiotis G. Ipeirotis, Nick Koudas, and Divesh Srivastava • Proceedings of the 19th IEEE International Conference on Data Engineering (ICDE), 2003
Aug 2002
Refereed
Distributed Search over the Hidden-Web: Hierarchical Database Sampling and Selection • Panagiotis G. Ipeirotis and Luis Gravano • Proceedings of the 28th International Conference on Very Large Databases (VLDB), 2002 • 69/432 = 16% accepted
Jul 2002
Refereed
Extending SDARTS: Extracting Metadata from Web Databases and Interfacing with the Open Archives Initiative • Panagiotis G. Ipeirotis, Tom Barry, and Luis Gravano • Proceedings of the Second ACM+IEEE Joint Conference on Digital Libraries (JCDL), 2002 • 33% accepted
Sep 2001
Refereed
Approximate String Joins in a Database (Almost) for Free • Luis Gravano, Panagiotis G. Ipeirotis, Hosagrahar Visvesvaraya Jagadish, Nick Koudas, Shanmugauelayut Muthukrishnan, and Divesh Srivastava • Proceedings of the 27th International Conference on Very Large Databases (VLDB), 2001 • 59/339 = 17% accepted
Jun 2001
Refereed
SDLIP + STARTS = SDARTS. A Protocol and Toolkit for Metasearching • Noah Green, Panagiotis G. Ipeirotis, and Luis Gravano • Proceedings of the First ACM+IEEE Joint Conference on Digital Libraries (JCDL), 2001
May 2001
Refereed
Probe, Count, and Classify: Categorizing Hidden-Web Databases • Panagiotis G. Ipeirotis, Luis Gravano, and Mehran Sahami • Proceedings of the 2001 ACM International Conference on Management of Data (SIGMOD), 2001 • 15% accepted
Dec 2011
Refereed
Examining the Impact of Search Engine Ranking and Personalization on Consumer Behavior: Combining Bayesian Modeling with Randomized Field Experiments • Anindya Ghose, Panagiotis G. Ipeirotis, and Beibei Li • Proceedings of the Workshop on Information Systems and Economics (WISE), 2011
Aug 2011
Refereed
What’s the Right Price? Pricing Tasks for Finishing on Time • Siamak Faridani, Björn Hartmann, and Panagiotis G. Ipeirotis • Proceedings of the 3rd Human Computation Workshop (HCOMP), 2011 • 16/52=30% accepted
Aug 2011
Refereed
Beat the Machine: Challenging Workers to Find the Unknown Unknowns • Josh Attenberg, Panagiotis G. Ipeirotis, and Foster Provost • Proceedings of the 3rd Human Computation Workshop (HCOMP), 2011 • 16/52=30% accepted
May 2011
Refereed
The Need for Standardization in Crowdsourcing • Panagiotis G. Ipeirotis and John J. Horton • Proceedings of the Workshop on Crowdsourcing and Human Computation at CHI, 2011
Mar 2011
Refereed
A Demo Search Engine for Products • Beibei Li, Anindya Ghose, and Panagiotis G. Ipeirotis • Proceedings of the 20th International World-Wide Web Conference (WWW), 2011
Feb 2011
Refereed
Estimating the Completion Time of Crowdsourced Tasks Using Survival Analysis Models • Jing Wang, Siamak Faridani, and Panagiotis G. Ipeirotis • Proceedings of the Workshop on Crowdsourcing for Search and Data Mining (WSDM11-CSDM), 2011
Jul 2010
Refereed
Quality Management on Amazon Mechanical Turk • Panagiotis G. Ipeirotis, Foster Provost, and Jing Wang • Proceedings of the Second Human Computation Workshop (HCOMP), 2010
Sep 2009
Refereed
Cramer’s Rule: How Information Content Moves Markets • Sinan Aral, Panagiotis G. Ipeirotis, and Sean J. Taylor • Proceedings of the 20th Workshop on Information Systems and Economics (WISE), 2009
Sep 2009
Refereed
The Economic Impact of User-Generated Content on the Internet: Combining Text Mining with Demand Estimation in the Hotel Industry • Anindya Ghose, Panagiotis G. Ipeirotis, and Beibei Li • Proceedings of the 20th Workshop on Information Systems and Economics (WISE), 2009
Oct 2008
Refereed
Answering General Time Sensitive Queries • Wisam Dakka, Luis Gravano, and Panagiotis G. Ipeirotis • Proceedings of the 2008 ACM CIKM International Conference on Information and Knowledge Management (CIKM), 2008
Jun 2008
Refereed
Stay Elsewhere? Improving Local Search for Hotels Using Econometric Modeling and Image Classification • Beibei Li, Anindya Ghose, and Panagiotis G. Ipeirotis • Proceedings of the Sixth International Workshop on the Web and Databases (WebDB), 2008 • 14/30 = 46% accepted
Jan 2008
Refereed
Detecting Important Events Using Prediction Markets, Text Mining, and Volatility Modeling • George Tziralis and Panagiotis G. Ipeirotis • Proceedings of the Third Workshop on Prediction Markets, 2008
Jan 2008
Refereed
The Impact of Information Disclosure on Stock Market Returns: The Sarbanes-Oxley Act and the Role of Media as an Information Intermediary • Karthik Balakrishnan, Anindya Ghose, and Panagiotis G. Ipeirotis • Proceedings of the Seventh Workshop on the Economics of Information Security (WEIS), 2008
Apr 2007
Refereed
Faceted Browsing over Large Databases of Text-Annotated Objects • Wisam Dakka, Panagiotis G. Ipeirotis, and Kenneth R. Wood • Proceedings of the 23rd IEEE International Conference on Data Engineering, Demonstrations (ICDE), 2007 • 28/73 = 38% accepted
Aug 2006
Refereed
Automatic Discovery of Useful Facet Terms • Wisam Dakka, Rishabh Dayal, and Panagiotis G. Ipeirotis • Proceedings of the ACM SIGIR 2006 Workshop on Faceted Search, 2006
Jan 2006
Refereed
Designing Ranking Systems for Consumer Reviews: The Impact of Review Subjectivity on Product Sales and Review Quality • Anindya Ghose and Panagiotis G. Ipeirotis • Proceedings of the 2006 Workshop on Information Technology and Systems (WITS), 2006 • 36/105 = 35% accepted
Aug 2005
Refereed
Reputation Premiums in Electronic Peer-to-Peer Markets: Analyzing Textual Feedback and Network Structure • Anindya Ghose, Panagiotis G. Ipeirotis, and Arun Sundararajan • Proceedings of the ACM SIGCOMM 2005 Third Workshop on Economics of Peer-to-Peer Systems, (P2PEcon), 2005
Jun 2003
Refereed
Modeling Query-Based Access to Text Databases • Eugene Agichtein, Panagiotis G. Ipeirotis, and Luis Gravano • Proceedings of the Sixth ACM SIGMOD International Workshop on the Web and Databases (WebDB), 2003 • 25% accepted
Jun 2001
Refereed
PERSIVAL Demo: Categorizing Hidden-Web Resources • Panagiotis G. Ipeirotis, Luis Gravano, and Mehran Sahami • Proceedings of the First ACM+IEEE Joint Conference on Digital Libraries (JCDL), 2001
May 2000
Refereed
Automatic Classification of Text Databases through Query Probing • Panagiotis G. Ipeirotis, Luis Gravano, and Mehran Sahami • Proceedings of the Third International Workshop on the Web and Databases, (WebDB), 2000 • 29% accepted
Mar 2011
Invited Misc Presentation
The Computer is the New Sewing Machine: Benefits and Perils of Crowdsourcing • Praveen Paritosh, Panagiotis G. Ipeirotis, Matt Cooper, and Siddharth Suri • Panel at the 20th International World-Wide Web Conference (WWW), 2011
Mar 2011
Refereed Misc Presentation
Managing Crowdsourced Human Computation: A Tutorial • Panagiotis G. Ipeirotis and Praveen K. Paritosh • Tutorial at the 20th International World-Wide Web Conference (WWW), 2011
Dec 2010
Misc Presentation
System, Method, Software Arrangement and Computer-Accessible Medium for Incorporating Qualitative and Quantitative Information into an Economic Model • US Patent 7,848,979
Mar 2010
Refereed Misc Presentation
Improving Product Search with Economic Theory • Beibei Li, Panagiotis G. Ipeirotis, and Anindya Ghose • Proceedings of the Workshops of 2010 IEEE 26th International Conference on Data Engineering (ICDE), 2010
Jan 2009
Invited Misc Presentation
Searching Digital Libraries • Panagiotis G. Ipeirotis • Encyclopedia of Database Systems, Part 19, Springer, 2009
Jan 2009
Invited Misc Presentation
Taxonomy Design for Faceted Search • Wisam Dakka , Panagiotis G. Ipeirotis, and Giovanni Maria Sacco • The Information Retrieval Series, Vol. 25, 175-213, Springer, 2009
Jan 2004
Unrefereed Misc Presentation
Classifying and Searching Hidden-Web Text Databases • Panagiotis G. Ipeirotis • Ph.D. Dissertation, Columbia University (advisor: L. Gravano), September 2004