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No, it is impossible to draw conclusions about causality from such statistics only studies. The only way to establish causality is a randomized experimental in
by shkkmo 8y ago
No, it is impossible to draw conclusions about causality from such statistics only studies. The only way to establish causality is a randomized experimental intervention.
The sort of study you describe can distinguish to some extent between "A causes B" and "B causes A" but can't tell them apart from "C causes A and B"
- mirimir 8y agoI was going to make that point too, but the idea of randomly providing cannabis and placebo was too implausible.