Heckman, James - Centre for Microdata Methods and Practice (CEMMAP) - 2008
emphasizes
the provisional nature of causal knowledge. Some statisticians reject the notion of the provi-
sional nature of causal … knowledge and seek an assumption-free approach to causal inference
(see, e.g., Tukey, 1986). However, human knowledge advances … components of treatments vary across studies,
knowledge does not accumulate across treatment effect studies, whereas it does …