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Thanks, G. That clarifies.
--- In amibroker@xxxxxxxxxxxxxxx, Graham <kavemanperth@xxx> wrote:
>
> each array is aligned with the data that it is based on. MA(C,5) is
> aligned to the close array, no offset applied
> This would align the ma with the Close3
>
> Close3 = ref( C, -3 );
> Centreline3 = ma( Close3, 5 );
> Buy = Close3 >Centreline3;
>
> If you want the signal to be C>MA and just have entry 3 bars later,
> then B is correct
> Of course you could always use something like this
>
> settradedelays(3,1,3,1);
> Buy = c>ma(c,5);
>
> or if you only want to scan on bar before the entry then simplified
> settradedelays(1,1,1,1);
> Buy = ref( c>ma(c,5), -3 );
>
>
>
> --
> Cheers
> Graham Kav
> AFL Writing Service
> http://www.aflwriting.com
>
>
>
> 2009/4/15 ozzyapeman <zoopfree@xxx>:
> >
> >
> > I know this is AFL 101 but I'm a bit confused on it.
> >
> > Let's say I wanted to Buy today if the Close of three days ago was higher
> > than its "center line" moving average. I know I have to shift the Close
> > array, but do I also have to shift the MA array to make this comparison? My
> > thought is yes.
> >
> > So of the two formulas below, Formula B should be the correct one. Or is it?
> > Does AFL automatically shift built-in function arrays when making
> > comparisons? In that case, Formula A would be correct.
> >
> >
> > Formula A
> >
> > CenterLine = MA(C, 5);
> >
> > Close3 = Ref(Close, -3);
> >
> > Buy = Close3 > CenterLine
> >
> >
> > Formula B
> >
> > CenterLine = MA(C, 5);
> >
> > CenterLine3 = Ref(CenterLine, -3);
> >
> > Close3 = Ref(Close, -3);
> >
> > Buy = Close3 > CenterLine3
>
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