Accumulative Swing Index (ASI-Cumulative Oscillation Index) The ASI (accumulative Swing Index), in Spanish the cumulative oscillation index is based on the Swing Index and is a wave-like oscillating indicator commonly used to verify and confirm breaks trendlines on price charts. ASI was developed by J. Welles Wilder. as a simple oscillating system (though the calculation itself is relatively complex), with signals generated by the rupture of maximum or minimum indicator. The trend lines drawn on the chart the indicator itself ASI also used to confirm or not …