The Wall Street Journal, February 2, 2011 by Barbara Martinez and Tom McGinty
http://on.wsj.com/hKOkaC
A trio of economists—Thomas S. Dee of the University of Virginia, Brian A. Jacob of the University of Michigan and Justin McCrary of the University of California at Berkeley—conducted an independent statistical analysis of the data for the Journal and came to a similar conclusion. They estimated that from 3% to 5% of the students statewide who were given passing grades for the five main Regents exams in June 2009 actually failed the tests.