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I agree I do want to just find the minimum ... not a +-1% level but I'd rather not detrend .. I want the length to grow if a trend is in place (a little like Vima)
----- Original Message -----
From: "Gary Funck" <gary@xxxxxxxxxxxx>
To: <omega-list@xxxxxxxxxx>
Sent: Wednesday, January 07, 2004 9:15 AM
Subject: RE: Cycle Length
>
>
> > -----Original Message-----
> > From: Chris Evans [mailto:evanscje@xxxxxxxxxxxxx]
> > Sent: Wednesday, January 07, 2004 7:45 AM
> > To: omega-list@xxxxxxxxxx
> > Subject: Cycle Length
> >
> >
> > I thought I'd try to use the ehlers cycle length idea to create a varying
> > term oscillator .. so the idea is to find the number of periods
> > you have to
> > go back in time until you reach the condition where the sum of
> > the closes or
> > the sum of (high+low)/2 =0 ..
> >
> > firstly I figure that + or - 1% will do since it will never sum
> > to exactly=0
> > .. so I wrote
> >
> > If Summation(Price, Len) <.01*Price and Summation(Price, Len) >-.01*Price
> > then
> > Cyclelen=len else len=len+1;
> >
> > which doesn't work .. clearly I need a loop .. any ideas?
> >
>
> Chris,
>
> I think that you'll need to first detrend the data, and generally you'll
> need to do that over an interval that is at least twice the cycle length.
> And then generally you should probably just take the minimum sum, rather
> than using some fixed percentage. An easy way to detrend is to just take
> the average of the first point in the series, and the last point and
> subtract
> it from each point. More elabote would be to run a least squares line fit
> through the data, and then subtract the best fit line value from each point.
>
>
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