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. 2021 Sep 8;17(9):e1009783. doi: 10.1371/journal.pgen.1009783

Fig 1.

Fig 1

Top: Typical assumptions underlying the causal interpretation of an exposure X or treatment T on an outcome Y following standard regression analysis. Note that we assume NUC implies exchangeability: B = Bottom-left: Assumptions underlying a standard MR analysis using genetic variant G as an IV to estimate the causal effect of X on Y. C = Bottom-right: Assumptions underlying a standard pharmacogenetic analysis.