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In the December issue, the Journal published a statistical debate on the deterrent effect of capital punishment between Professor Isaac Ehrlich and two sets of critics, Messrs. Baldus and Cole and Bowers and Pierce. Professor Ehrlich's original study of capital punishment, published last spring in the American Economic Review, used sophisticated statistical techniques to arrive at conclusions very different from earlier research in the field.4 Using regression analysis and economic theory, Ehrlich formulated and tested a model of the determinants of the murder rate, and found a significant deterrent effect associated with the use of the death penalty in the United States over the period from 1935 to 1969. The earlier research of Thorsten Sellin and others had consistently found no evidence of a deterrent effect. The issue of deterrence-in particular the technical merits of the Ehrlich study-has been raised in cases pending before the Supreme Court challenging the constitutionality of capital punishment.b In their critiques in the previous issue of the Journal, Baldus and Cole argue that Ehrlich's approach is less appropriate for testing the deterrent effect of capital punishment than are the less complex techniques used in

The Deterrent Effect of Capital Punishment: Ehrlich and His Critics