Ehlers Instantaneous Trendline Indicator
iTrend(HLC, alpha = 0.07, priceMethod = "Close")
an xts object containing High, Low, and Close price data.
a dampening factor -- default .07
use "Close" for close prices or any other string for (H+L)/2
iTrend, the instantaneous trendline indicator iTrigger -- the trigger line. Buy when this crosses above/sell when crossing under.