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Chrisb,
Since my previous references are mostly Fib oriented, here is the
best-fit parabola after the most recent peak.
The criterion is to make the Sum of abs(parabolic-H) minimum.
//The best-fit parabolic after the last peak
Plot(C,"C",1,64);perc=5;
x=BarIndex();xx=LastValue(x);
t1=LastValue(ValueWhen(PeakBars(H,perc)==0,x));
H1=LastValue(ValueWhen(PeakBars(H,perc)==0,H));
PlotShapes(shapeDownArrow*(x==t1),colorRed);
t=x-t1;diff1=H1*(xx-t1);f1=0.001;f2=2;
for(f=f1;f<f2;f=f+0.001)
{
parabolic=H1-f*t^2;
diff=LastValue(Sum(abs(parabolic-H),xx-t1));
if(diff<diff1)
{
diff1=diff;f1=f;
}
}
Plot(IIf(x>t1,H1-f1*t^2,-1e10),"",colorRed,1);
Title=Name()+", f1="+WriteVal(f1,1.3);
In general we need a range [0.001-2] for the coefficient f, MSFT is
0.005, ^NDX is 0,164 and ^N225 is 1,115 [f is obviously depended on
the price values...]
This will make the general formula relatively slow .
Note also that the best-fit coefficient will change every new day...
I think you can make a start towards the parabolic fitting.
A similar formula will give the best-fit parabola from the last
trough.
Dimitris
--- In amibroker@xxxxxxxxxxxxxxx, "DIMITRIS TSOKAKIS" <TSOKAKIS@xxxx>
wrote:
> Chrisb,
> I see, you put the peak/trough of the parabola at the local price
> peak/trough...
> I have already posted some attempts, see #65462, 65440, 65437,
65428
> of this list, it may help...
> Dimitris
> --- In amibroker@xxxxxxxxxxxxxxx, kris45mar <kris45mar@xxxx> wrote:
> >
> > Dimitris:
> >
> >
> >
> > Thank you for your interest in this.
> >
> >
> >
> > I suppose the parabolic trend line is a bit like all trend lines:
> you draw it on the chart and adjust it manually for a "best fit."
> >
> >
> >
> > It hasn't taken me long in AB to just flick through my watch list
> and eyeball the charts for a parabolic price rise and then just try
> and fit the Arc Draw tool.
> >
> >
> >
> > I do notice that the Arc Draw tool can be moved and resized a bit
> to get the "best fit". I don't suppose that squashing the Arc Draw
> tool would alter the basic exponential shape of the curve, but that
> is way beyond my maths knowledge. What I mean is, assuming the
curve
> is constructed on mathematical formula, would the formula change
> significantly if one compressed the width of the curve side to
side?
> If not, fine. If it does then it may make creation of a search
> formula less reliable.
> >
> > Does this make sense?
> >
> >
> >
> > It was just an off-hand thought that it might be nice to do a
Scan
> or Exploration for stocks which have price action which could be
> construed to be forming a parabolic curve. This would be based on
the
> lows of each bar following the exponential curve.
> >
> >
> >
> > Another issue if one were able to code this would be :
how "exact"
> would the fit have to be, or how much leeway or latitude would one
> accept in how perfect/imperfect the fit would have to be.
> >
> >
> >
> > I guess the problem is that to get the benefit of a short term
> rally one needs to be able to identify the parabolic nature of the
> trend early enough to be able to take a position, before it becomes
> vertical. By definition then when the trend line becomes vertical
> this signifies the end of the trend, and it's time to get out,
> because after that prices correct downwards rather quickly.
> >
> >
> >
> > There do seem to be a number of these patterns in the ASX market.
> >
> > I am not sure if this would be seen in other markets: human
nature
> being the same world wide, I would expect other markets to also
> exhibit this pattern.
> >
> >
> >
> > Here are some examples from today's market in Australia that fit
> the parabolic curve (see attached annotations)…
> >
> >
> >
> > http://www.members.iinet.net.au/~kris.mar/AWP.png
> >
> > http://www.members.iinet.net.au/~kris.mar/BBG.png
> >
> > http://www.members.iinet.net.au/~kris.mar/CDO.png
> >
> > http://www.members.iinet.net.au/~kris.mar/CEP.png
> >
> > http://www.members.iinet.net.au/~kris.mar/IFL.png
> >
> >
> >
> > I hope you can access these: if not I can email them to you.
> >
> >
> >
> > Regards
> >
> >
> >
> > Chrisb
> >
> >
> >
> >
> >
> >
> > DIMITRIS TSOKAKIS <TSOKAKIS@xxxx> wrote:chrisb,
> > Is it possible to describe, in words, what do you want to do ?
> > It is not hard to write parabolic lines in AFL but we need some
> > additional info.
> > Example: There is only one straight line through two points, but
> > there are many circles/parabolas/ellipses. For these [2nd degree
> > lines] we need one more info [a third point, a radius, a ratio,
> some
> > curvature etc.]
> > Dimitris
> > --- In amibroker@xxxxxxxxxxxxxxx, kris45mar <kris45mar@xxxx>
wrote:
> > >
> > > for anyone interested:
> > >
> > > Marcin tells me to just use the ARC drawing tool and this does
> > indeed work well with a bit of fiddling.
> > >
> > > Have a look see.
> > >
> > > Now, wouldn't it be nice to do a search based on this?
> > >
> > > chrisb
> > >
> > >
> > >
> > >
> > >
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