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Update backdoor_example.md #106

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Jul 30, 2023
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Update backdoor_example.md #106

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6 changes: 3 additions & 3 deletions docs/src/examples/backdoor_example.md
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Expand Up @@ -53,14 +53,14 @@ because that conditioning opens up a non-causal path via 6 ← 3 ← 1 → 4 ←
![Opened new path](https://raw.githubusercontent.com/mschauer/CausalInference.jl/master/assets/backdoor2.png)


But conditioning on both `Z = [3, 4]` solves the problem, as verified by the backdoor criterion.
But conditioning on both `Z = [4, 5]` solves the problem, as verified by the backdoor criterion.
```julia
backdoor_criterion(dag, 6, 8, [3, 4]) # true
backdoor_criterion(dag, 6, 8, [4, 5]) # true
```
(also conditioning on `Z = [4, 5]` would be possible.)
(also conditioning on `Z = [3, 4]` would be possible.)

Thus, regressing `Y` on `X` and controlling for variables numbered `Z=[3, 4]` we measure the average causal effect.
Thus, regressing `Y` on `X` and controlling for variables numbered `Z = [4, 5]` we measure the average causal effect.

![Good controls](https://raw.githubusercontent.com/mschauer/CausalInference.jl/master/assets/backdoor3.png)

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