Another Heckman study. Oh, I thought this sounded familiar: http://andrewgelman.com/2013/11/05/how-much-do-we-trust-this-claim-that-early-childhood-stimulation-

Another Heckman study. Oh, I thought this sounded familiar: http://andrewgelman.com/2013/11/05/how-much-do-we-trust-this-claim-that-early-childhood-stimulation-raised-earnings-by-42/ http://andrewgelman.com/2013/11/05/how-much-do-we-trust-this...