Understand the inputs
A common form is RSI = 100 − 100/(1 + RS), where RS is average gain divided by average loss. Wilder-style smoothing is widely used. Different initialization or smoothing choices can lead to different values.
Handle boundary cases
State how zero losses, zero gains and a completely flat sequence are handled. Confirm that the indicator has enough observations before using it. Platform implementations should be checked rather than assumed identical.
A threshold is not a forecast
A high or low RSI describes the selected sequence under that calculation. It does not guarantee a reversal. If a threshold becomes a trading condition, specify timing, exits and validation separately.
Sources & references
References support specific definitions or methodological context. Examples and research checklists are explanatory; no performance result is claimed.