🔗 Causal Effect

Causal Effect#

The change in an outcome caused by an intervention, all else equal.

Important

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What it is#

A causal effect is the change in an outcome directly caused by a change in a treatment, holding everything else constant — if X changes, how much does Y change because of X, and not because of other factors? This is strictly stronger than correlation, which shows only association; causation means X produces the change in Y.

The potential-outcomes view#

The Rubin causal model frames it with potential outcomes: \(Y(1)\) is a unit’s outcome if treated and \(Y(0)\) its outcome if not, so the causal effect for that unit is \(Y(1) - Y(0)\). Because we can only ever observe one of the two for any individual — the fundamental problem of causal inference — we estimate the average causal effect instead, \(\text{ACE} = \mathbb{E}[Y(1) - Y(0)]\).

Identifying it#

Every method exists to control for confounders — factors that influence both treatment and outcome. The toolkit runs from randomised controlled trials and matching / stratification through regression adjustment, instrumental variables and difference-in-differences, up to causal graphs (DAGs) for reasoning about confounding formally.

Why it matters#

A causal effect is the true impact of one variable on another — what would change if we intervened. It tests mechanisms in science, tells policy whether an intervention actually works, and measures the real business impact of marketing, pricing and product changes.

Theme: Causal Inference & Uplift · All terminology

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Mind map — connected ideas

Causal Inference · Causal ML (Causal Machine Learning) · Treatment Effect · Uplift · Incremental Conversions · Conversion Rate Uplift

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More in Causal Inference & Uplift

AUUC (Area Under the Uplift Curve) · Causal Impact · Causal Inference · Causal ML (Causal Machine Learning) · Causal Trees · Cumulative Incremental Gain (CIG) · Cumulative Uplift · Incremental Conversions · Incremental Gain · Incremental Recovery Rate (IRR) · Incremental Revenue · Incremental Sales · Qini Coefficient · Qini Curve