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Agree with MarkF2 regarding the linear
regression slope business. <FONT
size=2>There's nothing wrong with the formula used to convert radians to
degrees, but should it be used to convert a $/bar slope to a degree
slope? If the slope itself carries dimensional baggage, like the $
per bar, how is it handled? Would one want to convert a
miles per gallon slope to degrees?
<FONT
size=2>
Converting normal trigonometry
angular measurements from radians to degrees works fine, but there you
start with the *angular* measurement of radians (not $/bar) and end
with another *angular* measurement, degrees. If two stocks both have
$1/day slopes (and hence the same "degrees" value) but one is a $100 stock and
the other is a $10 stock, this "degree" equivalence might
be misleading to some. (Of course there may be the
possiblility of using something on the lines of <FONT
face=Symbol>(Dc/c)/(Dbar/bar) rather
than Dc/Dbar to get away
from the dimension business).
Having said that, it's still quite reasonable
and useful to me to visually check the angle made by
the linear regression line on the display, keeping in mind
that the angle I see could change if I change time frames, for
example. As Dimitris also has
previously pointed out, the angle one sees on the monitor screen will
be influenced by the zoom factor. Even AmiBroker's
autoscaling of the y-axis on the price chart will influence the angle
shown on the screen. Nevertheless, the line drawn on the monitor certainly
does have a slope associated with it that can be measured by degrees *on the
screen*.....with a protractor or a ruler (+ trig) for example, as determined
by the screen pixels. Change the chart's time frame, though, and the
angle may well be different.
Anyway, liked your AFL code and if the angle
business works for anyone, no arguments here. Probably good to move
on....
----- Original Message -----
<BLOCKQUOTE
>
<DIV
>From:
MarkF2
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Friday, June 20, 2003 9:04 AM
Subject: [amibroker] Re: Trendline with
Degree output
Anthony- Did you see my response to DT's post? This
is not a matterof opinion, the formula is being misapplied.
Mark--- In <A
href="">amibroker@xxxxxxxxxxxxxxx,
"Anthony Faragasso" <<A
href="">ajf1111@x...>wrote:> I would like to
thank Dimitri for lending a second pair ofeyes....and checking over the
formula for Trendline with Degreeoutput.....> >
Anthony> ----- Original Message ----- >
From: DIMITRIS TSOKAKIS > To: amibroker@xxxxxxxxxxxxxxx
> Sent: Thursday, June 19, 2003 4:19 AM>
Subject: [amibroker] Re: Trendline with Degree output> >
> The angle of QQQ *is* 4deg, the angle of ^NDX *is* 72deg
and the > formula *is* correct.> See
also #3825 message.> DT> --- In
amibroker@xxxxxxxxxxxxxxx, "Anthony Faragasso" <ajf1111@xxxx>
> wrote:> > Thanks Mark.....I am
looking into it.....> > > >
Anthony> > ----- Original Message -----
> > From: MarkF2 >
> To: amibroker@xxxxxxxxxxxxxxx >
> Sent: Tuesday, June 17, 2003 3:20 PM>
> Subject: [amibroker] Re: Trendline with Degree
output> > > > >
> Anthony- really nice, but I think there's a bug
somewhere. > Comparing>
> QQQ with NDX, I got slopes of 4 and 72 degrees respectively,
even> > though both trendlines were 27 days
and the slopes looked the > same.> >
> > Mark> >
> > --- In amibroker@xxxxxxxxxxxxxxx,
"Anthony Faragasso" >
<ajf1111@xxxx>> >
wrote:> > > //Automatic Support Trendline
With Degrees> > > >
> > //Anthony Faragasso, 2003>
> > > > > x =
Cum(1);> > > >
> > per =Param("Percent",2,0.01,3,0.01);// Sensitivity
setting> > > >
> > s1=L;//Array> > >
> > > EndValue1 = LastValue( Trough( s1,
per, 1 ) );> > > >
> > startvalue = LastValue( Trough( s1, per, 2 )
);> > > >
> > endbar = LastValue( ValueWhen( s1 == EndValue1, x, 1 )
);> > > >
> > startbar = LastValue( ValueWhen( s1 == startvalue, x, 1
) );> > > >
> > aS =
(EndValue1-startvalue)/(endbar-startbar);> >
> > > > bS =
EndValue1;> > > >
> > trendline = aS * ( x -endbar ) + bS;>
> > > > >
//-----------------------------------//> >
> > > >
// Conversion to
Degrees
//> > > >
> >
//-----------------------------------//> >
> > > >
pi=4*atan(1);> > > >
> > time=endbar-startbar;>
> > > > >
myslope=LinRegSlope(trendline,time);> > >
> > >
myradian=atan(myslope);> > >
> > >
mydegree=myradian*(180/PI);//Degrees> > >
> > >
//-------------------------------------//> >
> > > >
Plot(C,"close",colorBlack,styleCandle);> >
> > > >>
> Plot(IIf(x>startbar-5,trendline,->
1e10),"Trendline",colorYellow,styleLine);> >
> > > > direction=WriteIf(mydegree
>= 0 AND mydegree <= 0.99,"Flat> >
> ",WriteIf(mydegree > 0 ,"Rising ",WriteIf(mydegree <
> 0 , "Falling ",> >
"")));> > > >
> > DirectionColor=LastValue(IIf(mydegree
>> > 0,colorBrightGreen,IIf(mydegree <
0,> > > colorRed,IIf(mydegree >= 0 AND
mydegree <= > 0.99
,colorYellow,Null))));> > >
> > >
Title=Name()+"..."+Date()+"\n"+"TRENDLINE is>
> >
"+EncodeColor(directioncolor)+direction+EncodeColor(colorBlack)>
+"at> > "+"( "+>
> > WriteVal(mydegree,1)+" )"+"
Degrees";> > > >
> > > > >
> > > //plotting ( x, y )
grid> > > >
> >
Plot(startbar==x,"",colorRed,styleHistogram|styleOwnScale);>
> > > > >
Plot(ValueWhen(startbar==x,Low),"",colorRed,styleLine);>
> > > > >
//-----------------------------------//> >
> > > > // Automatic Anlaysis window
Output //> > > >
> >
//-----------------------------------//> >
> > > > // Settings :
//> > > >
> > // n last quotations and n=1 //>
> > > > > // explore
//> > > >
> >
//-----------------------------------//> >
> > > > Filter=mydegree > 0 OR
mydegree <0;> > > >
> > AddColumn(mydegree,"Degree",1);>
> > > > >
> > > >
> > > > >
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