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Ethnicity Preferences
In short: Selecting one or more ethnicity categories uses OR logic — more categories expand the pool. Coverage quality differs: strong in US/Canada census questions, weaker or estimated in parts of Europe.
Key points
- Multi-select expands the pool (OR)
- US/Canada: direct race/ethnicity survey items
- Europe: often estimated — treat with caution
FAQ
Why is ethnicity optional?
Many people don’t filter on it. When unused, we skip that multiplier entirely.