Has humility about knowledge grown over time?

Nobel Laureate James Heckman of the University of Chicago talks with EconTalk host Russ Roberts about the state of econometrics and the challenges of measurement in assessing economic theories and public policy. Heckman gives us his take on natural experiments, selection bias, randomized control trials and the reliability of sophisticated statistical analysis. The conversation closes with Heckman reminiscing about his intellectual influences throughout his career.