Patt Morrison for April 12, 2006

Crowd Statistics

Can a million man march only have 400,000 people? How many people are really involved in crowds of "tens of thousands" that have been reported in recent immigration marches? Accurately estimating the size of crowds is not only a daunting task, but has important implications for crowd safety, law enforcement, and event organizers. Professor Mike Alvarez of Caltech talks to Patt about how estimates are made, and how these numbers can be powerful tools for activists and officials.


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