[amibroker] Re: Sum Reference Not Same as Simply Adding Previous Data Points Manually

["davemabe2000" <davemabe@xxxxxxxxx>]

These both generate the same value neither of which is accurate:

VolumeSumB = Sum(Ref(Volume, -1), 3);
VolumeSumB = Ref(Sum(Volume, 3), -1);

--- In amibroker@xxxxxxxxxxxxxxx, Aron <aron.groups@xxx> wrote:
>
> have you tried:
> 
> VolumeSum = sum(Volume, 3);
> VolumeSumB = ref(VolumeSum, -1);
> 
> On 3/5/2010 5:43 PM, davemabe2000 wrote:
> > I'm trying to add the volume of the three previous bars (not including the current one) in my backtest.
> >
> > If I sum them up "manually" I get one value:
> >
> > VolumeSumA = Volume[i-1] + Volume[i-2] + Volume[i-3];
> >
> > But when I try using Sum and Ref to do it I get a different value for some reason.
> >
> > VolumeSumB = Sum(Ref(Volume, -1), 3);
> >
> > But VolumeSumA != VolumeSumB.
> >
> > What should I be using for Sum and Ref to get it to work properly and equal VolumeSumA above?
> >
> >
> >
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------------------------------------

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