Do operator: Difference between revisions

Revision as of 20:33, 2 June 2018

The do operator is used in causal inference to denote an intervention. Given random variables $X, Y$ , we write $Pr (Y = y ∣ d o (X = x))$ to mean the probability that $Y = y$ given we intervene and set $X$ to be $x$ . In some texts, this is abbreviated to $Pr (y ∣ \hat{x})$ (this notation assumes that the random variables corresponding to the individual values are clear from context).

In general $Pr (Y = y ∣ d o (X = x))$ is not the same as conditioning on $X = x$ , i.e. $Pr (Y = y ∣ X = x)$ .

The do operator is used extensively in the do calculus.

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	In general <math>\Pr(Y=y \mid \mathit{do}(X=x))</math> is not the same as conditioning on <math>X=x</math>, i.e. <math>\Pr(Y=y \mid X=x)</math>.		In general <math>\Pr(Y=y \mid \mathit{do}(X=x))</math> is not the same as conditioning on <math>X=x</math>, i.e. <math>\Pr(Y=y \mid X=x)</math>.

	The ''do'' operator is used extensively in the [[''do'' calculus]].		The ''do'' operator is used extensively in the [[Do calculus\|''do'' calculus]].