Ehlers Instantaneous Trendline

[erinys]

Hi,

Has anyone coded the 'Instantaneous Trendline' indicator developed by John Ehlers for NT? If so, could you please share.

Here is a post about the Instantaneous Trendline:

http://forum.esignalcentral.com/showthread.php?threadid=30703

Thanks!

Erin

[qewcool]

what i find weird about the original TS code for this in ehlers book is that the Smooth variable is not used anywhere in the code after it is defined

see :

///// EHLERS INSTANTANEOUS TREND INDICATOR /////
Inputs: Price ((H+L)/2), alpha(.07);
Vars: Smooth(0), // Smooth defined here but never used afterwards
iTrend(0),
Trigger(0);
iTrend = (alpha- alpha*alpha/4)*price
+ .5* alpha * alpha * Price[1] -
(alpha - .75 * alpha*alpha) * Price[2] + 2
*(1 - alpha) * iTrend[1] -(1 - alpha)
*(1-alpha)*iTrend[2];
If currentBar < 7 then iTrend = Price + 2*price[1]
+ Price[2]/4;


Trigger = 2*iTrend - iTrend[2];
// trigger different than in NT indicator code


plot1 (iTrend,"iTrend",blue);
plot2 (Trigger, "Trig",green);

[qewcool]

the code in the NT indicator archive for this seems to be different and it defines the Smooth variable.

Also the Trigger variable is different than the original TS code.

If anyone understand why this had been done like this, I would like to hear the explanation.

See NT code:

protected override void OnBarUpdate()
{


if (CurrentBar==0)
{
smooth.Set(0);
trigger.Set(0);
trend.Set(0);
TrendPlot.Set(0);
TriggerPlot.Set(0);

return;
}

int Per1=PeriodsP;
int Per2=PeriodsP;


if(CurrentBar <= 7)
return;

double SmoothTemp = (Median[0] + 2* Median[1] + 2* Median[2] + Median[3])/6; // here Smooth is defined

smooth.Set(SmoothTemp);


double ItrendTemp = (alpha - alpha*alpha/4)* smooth[0]+0.5*alpha*alpha*smooth[1]-(alpha-0.75*alpha*alpha)*smooth[2]+2*(1-alpha)*trend[1]-(1-alpha)*(1-alpha)*trend[2]; // smooth is used here

trend.Set(ItrendTemp);

trigger.Set(trend[1]); // trigger is defined here ...

TrendPlot.Set(trend[0]);
TriggerPlot.Set(trigger[0]);

}

[NinjaTrader_JoshP]

qewcool,

It would probably be more useful for users to know exactly which indicator you are using and where to get it. That way they can play with it too to help you understand what is being used. Thanks.

Also, you may want to try contacting the original author directly as they would probably be the best source to question why they coded it a certain way.

[qewcool]

the indicator is in NT indicator archive at

http://www.ninjatrader-support2.com/vb/local_links_search.php?action=show&s=&literal=1&search=instantaneous+trendline&desc=1&keys=1&ents=1

its called Instantaneous trendline indicator (itrend) ( second from the top of the search results).

For the TS code, Its in Ehlers book "cybernetic analysis for stock and futures" at p.24 but you can find it on the web too just search "ehlers and itrend"

[NinjaTrader_JoshP]

qewcool,

This code is a 3rd party customer provided code authored by Elliott Wave. Your best bet may be to try and contact him directly.