| Explaining away (Judea
Pearl) |
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| • | Even if two
hidden causes are independent, they can |
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| become dependent
when we observe an effect that they can |
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| both influence. |
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| – | If
we learn that there was an earthquake it reduces the |
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| probability
that the house jumped because of a truck. |
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| -10 |
| -10 |
| truck hits
house |
| earthquake |
| posterior |
| 20 |
| 20 |
| -20 |
| house jumps |