# Metrics

URL: https://docs.sigment.ai/concepts/metrics

What Sigment measures — audience size, core audience, reach and cost.

Sigment scrapes who engages with each creator's recent content and compares those people across creators. Every number is measured on that sample, not estimated from outside population data.

## Audience

| Metric | Meaning |
|---|---|
| **Unique audience sample** | Distinct people found engaging with the creators |
| **Frequency** | Engagements per person in the sample |
| **Core audience** | People who engage with **2 or more** of the creators (the core threshold, default 2) |
| **Core audience %** | Core audience sample ÷ unique audience sample |
| **Estimated audience size** | People these creators reach: sum of median impressions ÷ frequency. In `get_analysis_result` it's `overview.estimated_audience_size` |
| **Estimated core audience size (core reach)** | Estimated audience size × core audience %. In `get_analysis_result` it's `overview.estimated_core_audience_size` |

When a user asks "how big is the audience", answer with these two numbers.

## Per creator

| Metric | Meaning |
|---|---|
| **Median views** | Median impressions of the creator's content, ignoring zeros |
| **Reach** | Median views ÷ frequency |
| **Core reach** | The creator's share of the core audience size |
| **Cost per post** | Defaults to cost per view × median views; can be overridden |
| **Effective CPV** | Cost per post ÷ median views |

## Demographics

Sigment has **no per-follower gender, age or location**. `get_creator` returns audience demographics only for creators who connected their account. Treat words like "men", "US" or "18+" in a brief as rules for choosing creators (bio, location, language, content), and never block on missing demographics.