Re: [amibroker] What is Correlation

Thu, 09 Mar 2006 04:44:05 -0800

Hello,
 
Built-in correlation is calculated according to this formula:
 
\rho_{X,Y}=\frac{E(XY)-E(X)E(Y)}{\sqrt{E(X^2)-E^2(X)}~\sqrt{E(Y^2)-E^2(Y)}} 
 
 
 
It can be re-coded in AFL as:
 
 

function Correl( x, y, number )
{
 nom= MA( x * y, number ) - MA( x, number ) * MA( y, number );
 denom = sqrt( MA( x ^ 2, number ) - MA( x, number ) ^ 2 ) *
 sqrt( MA( y ^ 2, number ) - MA( y, number ) ^ 2 );
 return nom/denom;
}

Graph0=Correlation( C, Ref( H, -2 ), 10 ); // built-in

Graph1=Correl( C, Ref( H, -2 ), 10 ); // re-coded;


Best regards,
Tomasz Janeczko
amibroker.com

----- Original Message -----
From: "Graham" <[EMAIL PROTECTED]>
To: "amibroker" <[email protected]>
Sent: Thursday, March 09, 2006 8:29 AM
Subject: [amibroker] What is Correlation

> Can anyone tell me what Correlation is actually calculating
> I have read the description in help files but am still confused what
> it is actually calculated.
> In what way is it actually comparing the 2 arrays.
>
> --
> Cheers
> Graham
> AB-Write >< Professional AFL Writing Service
> Yes, I write AFL code to your requirements
> http://e-wire.net.au/~eb_kavan/ab_write.htm
>
>
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