Dueling Economists Reach Settlement in Defamation Lawsuit

John R. Lott Jr.'s defamation lawsuit against a fellow economist, Steven D. Levitt, has been settled. But it may yet roar back to life.

In documents filed last month in federal court, the two parties outlined a settlement that requires Mr. Levitt, a professor of economics at the University of Chicago and a co-author of the best-selling book Freakonomics: A Rogue Economist Explains the Hidden Side of Everything, to send a letter of clarification to John B. McCall, a retired economist in