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by oniTony 4463 days ago
I went back to the Analytics Admin panel to double check, and it indeed looks like filters are applied to specific views. The tracking code collects data at the property level.

From https://support.google.com/analytics/answer/2637192?hl=en

> If the number of visits/sessions to the property in the given date range exceeds 250K visits/sessions, GA will employ a sampling algorithm...

> It is important to note that session sampling occurs at the property level, not the view level.

So it sounds like reports will sample 250K from total traffic first, and apply the view filter after. This has the potential to be left with reports generated on too small of a sample.