Extended Data Fig. 3: Deterministic Finite State Machine in NightSignal algorithm.
From: Real-time alerting system for COVID-19 and other stress events using wearable data
The state machine consists of six states, each labeled with an alert color and three symbols for transition between states based on the current average RHR overnight and the deviation level from the baseline (streaming median of averages of RHR overnight). For example, a red alert gets triggered if for two consecutive nights, the average RHR overnight is at least four bpm above the calculated baseline.
