Navigation: Realtest Script Language > Syntax Element Details > ADX Category Indicator Functions Description Wilder's Average Directional Index Syntax ADX(len) Parameters len - lookback period Notes Calculation uses the original Welles Wilder formula. Wilder's exponential smoothing is equivalent to using 2*len-1 in a regular exponential moving average. This indicator supports one-pass calculation when used in the Data Section with a non-variable length. Copyright © 2020-2025 Systematic Solutions, LLC