Carnegie Mellon University Research Showcase @ CMU Heinz College Research Heinz College 3-7-2011 Aggregation Bias in Sponsored Search Data: he Curse and he Cure Vibhanshu Abhishek Carnegie Mellon University, vibs@andrew.cmu.edu Kartik Hosanagar University of Pennsylvania Peter S. Fader University of Pennsylvania Follow this and additional works at: htp://repository.cmu.edu/heinzworks Part of the Databases and Information Systems Commons , and the Public Policy Commons his Working Paper is brought to you for free and open access by the Heinz College at Research Showcase @ CMU. It has been accepted for inclusion in Heinz College Research by an authorized administrator of Research Showcase @ CMU. For more information, please contact research- showcase@andrew.cmu.edu.