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[amibroker] Re: Correlation



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In other words, your variation is of the autocorrelation type. 
Moreover, it is statistically more correct to detrend the inputs: use 
ROC(C,1) and ROC(Foreign...) as inputs.

PS

--- In amibroker@xxxxxxxxxxxxxxx, Graham <kavemanperth@xxx> wrote:
>
> You are comparing one stock to itself. ie the chosen arrays C &
> ref(C,-5) over the period defined (5)
> to find correlation between to stocks you would need to have one as
> foreign symbol array
> eg
> a = Correlation( C, Foreign('ABCDE","C"), 5);
> 
> 
> -- 
> Cheers
> Graham Kav
> AFL Writing Service
> http://www.aflwriting.com
> 
> 
> 
> On 19/03/2008, mytakeismine <mytakeismine@xxx> wrote:
> > oops:(   correction:  run the period
> >
> >  --- In amibroker@xxxxxxxxxxxxxxx, "mytakeismine" <mytakeismine@>
> >  wrote:
> >
> > >
> >  > Hi Bill, yes and yes?
> >  > After rereading a few times I think the -5 is in the
> >  > Ref(Close, -5) and I think I know what yor saying that 
the "other"
> >  5
> >  > is how long to run the array. Having two 5's in one example is 
a
> >  > little confusing.
> >  >
> >  > When I ran an AA and obtained a correlation factor of .97 
between 2
> >  > stocks (ref(close,-1) vrs close) over 30 days  vrs manually
> >  > calculating the same 2 stocks over the same period 1 day 
apart, I'm
> >  > not even close... one stock up, the other should be up the next
> >  day,
> >  > when one is down the other should be down?
> >  >
> >  > What variable am I missing to not have a better 1 to 1 outcome?
> >  > Any help Any One?
> >  >
> >  > Thanks
> >  >
> >  > kj
> >  >
> >  >
> >  >  --- In amibroker@xxxxxxxxxxxxxxx, "wavemechanic" <timesarrow@>
> >  > wrote:
> >  > >
> >  > > I believe the answer is yes and yes.  Ref() is generating an
> >  array
> >  > of C that are 5 days back from every C.  Correlation(..., ..., 
5)
> >  > calculates the correlation between C and Ref() over a 5 day 
period
> >  > and returns an array of these values.  To keep things straight 
you
> >  > have to keep in mind what arrays are and the meaning and
> >  calculation
> >  > of correlation values (r).
> >  > >
> >  > > Bill
> >  > >
> >  > >
> >  > > ----- Original Message -----
> >  > > From: "mytakeismine" <mytakeismine@>
> >  > > To: <amibroker@xxxxxxxxxxxxxxx>
> >  > > Sent: Tuesday, March 18, 2008 7:15 PM
> >  > > Subject: [amibroker] Correlation
> >  > >
> >  > >
> >  > > > Hi I asked this back a few weeks ago... I am not sure I
> >  > understand so
> >  > > > if anyone could elaborate.
> >  > > >
> >  > > > In the user guide it states under Correlation:
> >  > > > SYNTAX  correlation( ARRAY1, ARRAY2, periods )
> >  > > >
> >  > > > EXAMPLE // Correlation between Close price AND AND Close 
price
> >  5
> >  > days
> >  > > > back
> >  > > > Correlation( Close, Ref( Close, -5 ), 5 );
> >  > > >
> >  > > > In the example it states 5 days back, so is the -5 as in
> >  > > > ( Close, -5 ) the 5 days back.
> >  > > > Or is the ", 5 );" as in "periods"  in the syntax the 5 
which
> >  > causes
> >  > > > the 5 days back?
> >  > > >
> >  > > > Too many 5's
> >  > > >
> >  > > > Thanks for your help and explanation!
> >  > > > kj
> >  > > > mytakeismine
>



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