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#causality #statistics

Definition 3.3 (blocked path) A path between nodes ๐‘‹ and ๐‘Œ is blocked by a (potentially empty) conditioning set ๐‘ if either of the following is true:

1. Along the path, there is a chain ยท ยท ยท โ†’ ๐‘Š โ†’ ยท ยท ยท or a fork ยท ยท ยท โ† ๐‘Š โ†’ ยท ยท ยท, where ๐‘Š is conditioned on (๐‘Š โˆˆ ๐‘).

2. There is a collider ๐‘Š on the path that is not conditioned on ( ๐‘Š โˆ‰ ๐‘ ) and none of its descendants are conditioned on (de(๐‘Š) * ๐‘)

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owner: crocodile - (no access) - Introduction_to_Causal_Inference-Nov19_2020-Neal.pdf, p36


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