Just finished reading “Transportability across studies: A formal Approach” by Judea Pearl and Elias Bareinboim, March 2012, UCLA, Technical Report R-372.

Another gem by Professor Pearl and Elias Bareinboim.  It identifies the external validity practice of making threats versus license.  The causal mechanisms in an experimental group and the observational group influence license for external validity.   There is even help  for moving from an observational situation to another observational population.   This is a must reading for any serious statistician or practitioner that creates statistical models and then applies them.

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