Help. Simple Request on ADX if possible.

August 18th, 2010, 04:51 PM

Hello. How do we change the smoothing of the ADX? Other packages like Esignal, Ameritrade StrategyDesk, Stockcharts.com, etc allow us to change 2 variables: length, and smoothing of the ADX. However, the ADX on Tradestation/Multicharts only allow us to input 1 variable, the length. How do are we able to change the smoothing?
On Esignal for example, ADX of 14 w/ no smoothing would be a setting of (14,14). An ADX of 10 would be (10,10)etc. If you want to change it to 12 days and 9 smoothing it would be (12,9). Since TS/MC doesn't give you an area to change the smoothing how do we do it?

Here are some reference links I reserached to help illustrate:

eSignal Forums - ADX (Welles Wilder)
Strategy Desk - Help Center
Investor/RT Tour - ADX (Average Directional Movement)

If anyone out there knows how to add the smoothing input, I would be VERY appreciated.
Thanks in Advance.

August 18th, 2010, 05:16 PM

Untested, but this should do it.

Code

                            


inputs: 

    Length( 14 ),

    Smooth ( 3 ) ;



variables:

    var0( 0 ) ;



var0 = Average(ADX( Length ), Smooth ) ;



Plot1( var0, "ADX" ) ;



condition1 = var0 > var0[1] and var0[1] <= var0[2] ;

if condition1 then

    Alert( "Indicator turning up" )  

    

else 

begin 

condition1 = var0 < var0[1] and var0[1] >= var0[2] ;

if condition1 

then

    Alert( "Indicator turning down" ) ;

    end

Mike

August 18th, 2010, 05:34 PM

Hi BigMike

Thanks for helping. I just tested it, but I guess it's not the correct formula. I'm not sure what the actual smoothing code is, but one way to test it, is to compare it against the standard ADX.

In theory, 14 periods, and 14 smoothing (14,14) should = the standard ADX.

If we look at the daily SPY chart, today (Aug 18), the standard ADX closed at 16.73. When I inputed 14,14 on the new code created, I got 15.96. Obviously not a big difference on this scale, but if I changed to a 5 minute chart on say 3 periods chart on a more volatile instrument, the difference would be huge.

Since I'm not a programmer I guess I don't know how to find the code for smoothing. Perhaps an Exponential MA? But I'm not sure.

The links I mentioned earlier hopefully would give an idea of what it's "supposed" to look like?
Again more assistance would be appreciated.

August 18th, 2010, 08:18 PM

Hey BigMike,

I just played around w/ the code you put, and wanted to give a little feedback. On the other software packages, if you put the same smoothing #, you get the standard ADX. For instance, (14,14) on Esignal you get the standard ADX(14). So basically, you increase or decrease smoothing from there.

On the code you wrote, (14,1) = the standard ADX. I don't know what the relationship codewise is, but can it be turned around where (14,14) = the standard ADX? Then I can add or subtract the smoothing from there to match studies I am working on.

thanks

August 18th, 2010, 10:24 PM

I found the formula to implement the smoothing. Apparently it's not just a simple moving average. If anyone could be so kind as to help me code it, since I'm not a programmer.

I got the formula from this webpage: Investor/RT Tour - ADX (Average Directional Movement)

ADXi = [(ADX(i-1) * (n - 1)) + DXi] / n
where n = Smoothing Period
DX = [ 100 * ABS( (+ [COLOR=#0066cc]DI[/COLOR]) - (- [COLOR=#0066cc]DI[/COLOR]) ) ] / ( (+ [COLOR=#0066cc]DI[/COLOR]) + (- [COLOR=#0066cc]DI[/COLOR]) )

This is the formula for the ADX. Notice, there are 2 variables, that can be input:
i: the length (this is something that standard TS and MC can be entered)
n: the smoothing. This is the variable that I wanted to put in that some software allows, but TS and MC's ADX's indicator formula doesn't give a place to enter.

Is there anyone that can code this that can allow both variables to be input? i and n? The standard ADX only allows i.

Much appreciated

Help. Simple Request on ADX if possible.

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Help. Simple Request on ADX if possible.