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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@xxxxxxxxx> wrote:
> oops:( correction: run the period
>
> --- In amibroker@xxxxxxxxxxxxxxx, "mytakeismine" <mytakeismine@xxx>
> 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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