Parabolic SAR (Wilder clamp / TA-Lib reference)Parabolic SAR matching TA-Lib’s reference implementation
TradingView’s built-in ta.sar() omits one of Wilder’s rules: the SAR may not sit inside the current or prior bar’s range. Without that clamp the SAR can land where price has already traded, and the flip arrives a bar late. On SPY daily I found two flips that landed late for this reason.
Wilder left three things open. This script follows TA-Lib on all three:
Seeding — start long unless Wilder’s −DM between bars 0 and 1 exceeds +DM. First
インジケーター























