the subjective component in causal information does not necessarily diminish over time, even as the amount of data increases. Two people who believe in two different causal diagrams can analyze the same data and may never come to the same conclusion, regardless of how “big” the data are. This is a terrifying prospect for advocates of scientific objectivity, which explains their refusal to accept the inevitability of relying on subjective causal information. On the positive side, causal inference is objective in one critically important sense: once two people agree on their assumptions, it
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