• Ehlers Indicators for TradeStation

Posted: **Sat Dec 27, 2025 11:09 am**

Ultimate Strength Index (USI)

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TradeStation: November 2024
In “Ultimate Strength Index (USI)” in this issue, John Ehlers introduces an enhanced version of the RSI with significantly reduced lag. The USI retains many benefits of the traditional RSI, while providing faster, more responsive results. It highlights bullish and bearish conditions and allows for adjustments based on different data lengths, typically using more data than the standard RSI to achieve comparable outcomes.

Code: Select all

Function: $UltimateSmoother
{
	UltimateSmoother Function
	(C) 2004-2024 John F. Ehlers
}

inputs:
	Price( numericseries ),
	Period( numericsimple );
	
variables:
	a1( 0 ),
	b1( 0 ),
	c1( 0 ),
	c2( 0 ),
	c3( 0 ),
	US( 0 );
	
a1 = ExpValue(-1.414*3.14159 / Period);
b1 = 2 * a1 * Cosine(1.414*180 / Period);
c2 = b1;
c3 = -a1 * a1;
c1 = (1 + c2 - c3) / 4;

if CurrentBar >= 4 then 
 US = (1 - c1)*Price + (2 * c1 - c2) * Price[1] 
 - (c1 + c3) * Price[2] + c2*US[1] + c3 * US[2];
 
if CurrentBar < 4 then 
	US = Price;

$UltimateSmoother = US;

Indicator: Ultimate Strength Index (USI) 

{
	TASC NOVEMBER 2024
	Ultimate Strength Index (USI)
	(C) 2024 John F. Ehlers
}

inputs:
	Length( 14 );

variables:
	SU( 0 ),
	USU( 0 ),
	SD( 0 ),
	USD( 0 ),
	USI( 0 );

if Close > Close[1] then 
	SU = Close - Close[1] 
else 
	SU = 0;

USU = $UltimateSmoother(Average(SU,4), Length);

if Close < Close[1] then 
	SD = Close[1] - Close 
else 
	SD = 0;

USD = $UltimateSmoother(Average(SD, 4), Length);

If (USU + USD <> 0 and USU > .01 and USD > .01) then 
	USI = (USU - USD) / (USU + USD);

Plot1( USI, "USI" );
Plot2( 0, "Zero Line" );

FIGURE 1: TRADESTATION. A daily chart of the emini S&P 500 continuous futures contract (ES) demonstrates the ultimate strength index indicator applied.

Ehlers Indicators for TradeStation

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