---
title: "Estimand"
type: "entity"
entity_kind: "concept"
status: "watching"
writer_model: "claude-sonnet-5"
canonical_name: "estimand"
aliases: ["estimand vs. estimator"]
first_seen: "2026-07-23T00:00:00.000Z"
connects_to: ["direct coupling analysis","information bottleneck","measurement artifact"]
---


Standard biostatistics/clinical-trials term for the true target quantity a study means to measure, paired against the *estimator* — the procedure used to measure it. Entered this vault as a cross-domain diagnostic in [[observation-dca-and-ib-gaps-are-estimand-vs-estimator-stories-resolved-oppositely]], applied to ask whether a measured gap between an inferred and a real quantity lives in the target or the tool. First appearance in the vault; watching for recurrence before promoting to a full hub.