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Thanks to all for the dialog on this indicator.
Herman, your sample Guppie code does a good job of illustrating the
nature of the problem.
Thanks and regards.
Phsst
--- In amibroker@xxxxxxxxxxxxxxx, "Herman vandenBergen" <psytek@xxxx>
wrote:
> If i remember correctly I found the following code on Guppie's site; it
> validates and colors the Zig to show when Zig is valid (doesn't look
ahead).
> For details goto the Guppie site - perhaps some kind soul can post
the URL -
> I don't have it handy. Actually, if you do a search on the Zig
you'll find a
> European individual who made quite a study of it and has several
detailed
> report posted on his web site - I thin it was the person who
developed the
> Validation routine - there are also numerous discussions around... I'm
> working with limited Internet access and can't be more specific.
>
> herman
>
> P1 = 6;
> Z = Zig(C,P1);
> last=ValueWhen(( Z > Ref(Z,-1) AND Ref(Z,-1) < Ref(Z,-2) ) OR ( Z <
> Ref(Z,-1) AND Ref(Z,-1) > Ref(Z,-2) ),Ref(Z,-1),1);
> pc=(C-last) * 100 / last;
> pc= abs(pc);
> SD=(z>Ref(z,-1) AND Ref(z,-1)>Ref(z,-2)) OR (z<Ref(z,-1) AND
> Ref(z,-1)<Ref(z,-2));
> res=IIf(pc>=P1 ,1,0);
> Plot(Z,"Z",res+1,1);
>
>
>
> -----Original Message-----
> From: Phsst [mailto:phsst@x...]
> Sent: November 25, 2003 2:57 AM
> To: amibroker@xxxxxxxxxxxxxxx
> Subject: [amibroker] Re: Peak & Zig Zag
>
>
> Excuse me... Enter key on Subject Line gets me too often.
>
> It is clear that Zig Zag *can* give unrealistic test results because
> it looks into the future. This is documented. But there is almost the
> caveat *can* included in the caution.
>
> But are there any known conditions where test results can be
relied upon.
>
> For example if a calculated trendline up to the current bar is more
> than a few bars old, and is linear for those past bars, and correlates
> (for lack of a better word) with current bar close price, does this
> not perhaps mean that an assumption can be safely made that future
> prices have not yet influenced the current trend?
>
> Regards,
>
> Phsst
>
>
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