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Have you tried contacting cheryl at Equis?
Lionel Issen
lissen@xxxxxxxxx
----- Original Message -----
From: "C.S." <csaxe@xxxxxxxxxxx>
To: "MetaStock List" <metastock@xxxxxxxxxxxxx>
Sent: Friday, March 23, 2001 12:11 PM
Subject: More PREV Stuff
> Just when I thought that I was beginning to figure out Metastock formula
> language, the following was listed in Apr 01 TASC Traders' Tips as the
> solution to Ehler's nonlinear filter article. The first one is easy to
> figure out from the article.
>
> {Ehlers Filters}
> ti:=15;
> pr:=MP();
> coef:=Abs(pr-Ref(pr,-5));
> Sum(coef*pr,ti)/Sum(coef,ti)
>
>
> This one works, but has me stumped as to how it works according to the
> article. You really have to read the article to understand what is being
> calculated here.
>
> {Distant Coefficient Ehlers Filter}
> ti:=15;
> pr:=MP();
> coef:=Sum(Power(Ref(LastValue(pr+PREV-PREV)-pr,-1),2),ti);
> Sum(coef*pr,ti)/Sum(coef,ti)
>
> The two PREV would appear to be just adding a number and then subtracting
a
> number, leaving "pr" but that isn't the case. The formulas were written by
> Cheryl Abram of Equis. It would be nice if someone at Equis would consider
> having her give a us a quick class on how this works and other formula
> construction tips.
>
> I came up with:
>
> ti:=15;
> pr:=MP();
> coef:=Sum(Power(LastValue(pr)-Ref(pr,-1),2),ti);
> Sum(coef*pr,ti)/Sum(coef,ti)
>
> This works too, but doesn't follow rapid price changes as quickly as
> Cheryl's formula.
>
> Any ideas on how the two PREV act together?
>
> -Corey
>
>
>
>
>
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