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[amibroker] Re: afl help, suggestion needed



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Alma Miranda,

I have added a homemade 'smoothness' indicator to Ian/Tomasz's 
RSquared (it is a interesting comparison).

Run in an exploration and sort columns by R2 or SLR(StraightLineRatio)
to see that they report similar things.

The logic of SLR is "how long is a piece of string?"

I added every daily $move and compared that to the point to point 
$Value as a ratio - it is not an abolute indicator - it only shows 
relative smoothness - I tried % changes but that doesn't work.

Other candidates for smoothness that I can think of are StDev and 
StandardError (the regression version?).

I have been a little bit interested ever since I studied Professor 
John Prices techno-fundamental method (he picks stocks based 
on 'smooth' earnings growth) - I figured 'smooth' charts might be a 
TA surrogate for 'smooth' earnings and save the trouble of doing the 
fundamental calculations.

http://www.conscious-investor.com/index.html

Here is the modified formula:

//F_RSquared
//Tomasz Janeczko
//Adapted by Ian Watts


//I have changed it slightly to use R * R instead
//of R^2 to speed up the calculation.

//The exploration aims to find stocks that are
//currently going up OR down relatively
//smoothly.


function RSquared(array, periods)
{
R = Correlation(BarIndex(), array,
periods );
R2 = R * R;
return R2;
}

Periods = 250;

R2 = RSquared(C, Periods);
LVR2 = LastValue(R2);

//Filter = LVR2 > 0.9;

Filter = 1;

AddColumn(R2, "RSquared",1.1);

/////////////////////////////////////////////////////////

//P_StraightLineRatio

//Periods = 250;

Change = abs(C - Ref(C,-1));

Total = Sum(Change,Periods);

StraightLine = abs(C - Ref(C,-Periods));

StraightLineRatio = Total/StraightLine;

Filter = 1;
//Filter = StraightLineRatio <= 30;
//Filter = BarCount == 1305;

AddColumn(StraightLineRatio,"SLR",1.1);
AddColumn(BarCount,"BarCount",1);

Plot(StraightLineRatio,"SLR",1,1);


Have fun,

brian_z

--- In amibroker@xxxxxxxxxxxxxxx, "Ian Watts" <idw456@xxx> wrote:
>
> Brian
> 
> The function was written by Thomasz and can be 
> found here:
>  http://www.traders.com/Documentation/
> FEEDbk_docs/Archive/122007/TradersTips/
> TradersTips.html#amibroker
> 
> 
> function RSquared(array, periods) 
> { 
> 	R = Correlation(BarIndex(), array, 
> periods );
> 	R2 = R * R;
> 	return R2; 
> }
> 
> R2 = RSquared(C, NoPeriods);
> LVR2 = LastValue(R2);
> Filter = LVR2 > 0.9;
> 
> I have changed it slightly to use R * R instead 
> of R^2 to speed up the calculation.
> 
> The exploration aims to find stocks that are 
> currently going up or down relatively 
> smoothly.  
> 
> All the Best
> 
> Ian
> 
> --- In amibroker@xxxxxxxxxxxxxxx, 
> "brian_z111" <brian_z111@> wrote:
> >
> > Ian Watts,
> > 
> > How can I do that in AFL?
> > Have you seen the R-Squared formula at the 
> AFL library - any comment 
> > on that?
> > 
> > Any hints greatly appreciated.
> > 
> > Thanks,
> > 
> > brian_z
> > 
> > 
> > --- In amibroker@xxxxxxxxxxxxxxx, "Ian 
> Watts" <idw456@> wrote:
> > >
> > > A method I use is to fit a least squares 
> line 
> > > to the last 20 or so bars.  Then calculate 
> R 
> > > Squared and select the stocks with the 
> highest 
> > > values of R Squared.
> > > 
> > > Regards
> > > 
> > > Ian
> > > 
> > > 
> > > --- In amibroker@xxxxxxxxxxxxxxx, 
> > > "safetrading" <safetrading@> wrote:
> > > >
> > > > With every strategy I have used, I have 
> > > always noticed that I get 
> > > > whipsawed out more often with stocks that 
> > > don't flow smoothly and 
> > > > therefore have tried to create a filter 
> that 
> > > does nothing more than 
> > > > find stocks which flow smoothly up and 
> down.
> > > > 
> > > > The best I have come up with is one that 
> > > simply limits the number of 
> > > > up and down fractals in a given time 
> period.  
> > > While this helps, it 
> > > > does not really produce what I was hoping 
> to 
> > > get.
> > > > 
> > > > Can anyone offer any help or suggestions 
> with 
> > > this?
> > > > 
> > > > Thanks,
> > > > 
> > > > Safetrading
> > > >
> > >
> >
>



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