An Oura ring and an Apple Watch report the same body differently, and the ring throws outliers that are just wrong.
I built the Vault around trends and correlations. Outlier points get discarded, and it flags when two devices' trends diverge.
The measured numbers disagree, but the trend lines usually follow each other. When one trends down and the other trends up over the same period, that's a real problem worth looking at. Blood work works the same way. It's all about the trends and correlations.
The Vault tracks trends across devices and labs.
One reading is noise. Two sources disagreeing in direction is signal.