NOTE-003 / Essay / Published

KPI Denominator Truth

A long-form analytics article on why KPIs fail when denominator definitions silently change, and how denominator contracts make ratio metrics more decision-safe.

NOTE-003 / question

Central question

Why do ratio KPIs sometimes improve even when the business reality has not improved?

NOTE-003 / key ideas

Core ideas

Denominator contracts

The essay argues that every KPI needs an explicit denominator definition and eligibility rule.

Population drift

Observed, attempted, eligible, and reachable populations can change independently of true performance.

Metric auditability

Decision-safe KPIs require time alignment, coverage checks, mix-shift awareness, and practical audit checklists.

NOTE-003 / skills demonstrated

Data scientist thinking shown

KPI design

Shows mature thinking about metrics as contracts, not just chart values.

Product analytics

Connects denominator drift to decision risk in product and business dashboards.

Data literacy

Explains how subtle population changes can create misleading improvements or declines.

NOTE-003 / source

Read the full essay

This page summarizes and positions the essay inside the honardoust.codes lab index. The full original essay is kept in its GitHub repository.

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