An Introduction to Causal Discovery, a Bayesian Network Approach [//www.slideshare.net/COST-events/an-introduction-to-causal-discovery-a-bayesian-network-approach] from COST action BM1006 [//www.slideshare.net/COST-events] "According to Reichenbach's principle, a correlation between two variables x and y can arise either because x is a cause of y, y is a cause of x,