Re: [amibroker] How to enhance Linear Regression Channel Code to plot two previous days

["Ara Kaloustian" <ara1@xxxxxxxxxx>]

You need two pieces of information to find the linear regression:
1. Last point of interest : LinearReg( ARRAY, periods )
2. First point of interest:  LinRegIntercept( ARRAY, periods )

To find LR for 2 days ago use Ref(Close,-2) for Array.

Then use LineArray function to draw the line between the two points.

To get the channel, use the standard error code in the code below.
To extend the channel to today, use the proper parameter on the linearray 
function

I have not tested this, so the channel may draw to the current day without 
extending.. I am not sure

The ending point:
----- Original Message ----- 
From: "tradinghumble" <sharp2be@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Monday, July 28, 2008 9:42 PM
Subject: [amibroker] How to enhance Linear Regression Channel Code to plot 
two previous days


> Hello, I've seen this nice piece of code that plots linear regression
> code and was wondering if anyone could help me with a hint on how to
> plot the channel two days ago and extend it into today. I've already
> fried my brain, can't get it... thanks in advance.
>
> SetBarsRequired(100000,0);
> bar = BarIndex();
> islastbar = bar == BarCount -10;
> isfirstbar = bar == BarCount - 100;
> firstbar = LastValue( ValueWhen( isfirstbar, bar ) );
> lastbar = LastValue( ValueWhen( islastbar, bar ) );
> al = LastValue( ValueWhen( islastbar, LinRegSlope( C, Lastbar -
> firstbar + 1 ) ) );
> bl = LastValue( ValueWhen( islastbar, LinRegIntercept( C, Lastbar -
> firstbar + 1 ) ) );
> Lr = al * ( BarIndex() - firstbar ) + bl;
> Lr = IIf( bar = firstbar AND bar <= lastbar , Lr, Null );
> se = StdErr(C,Lastbar - firstbar);
> se = LastValue( ValueWhen( islastbar, StdErr( C, Lastbar - firstbar +
> 1 ) ) );
> upper = Lr + se;
> Lower = Lr - se;
>
> Plot(Lr, "lr", colorYellow, styleThick );
> Plot(upper, "upper", colorGreen, styleThick );
> Plot(Lower, "lower", colorRed, styleThick );
> SetBarFillColor( IIf( C  O, colorBrightGreen, colorRed ) );
> Plot(C, "C", colorWhite, styleCandle );
> Title = "bar= " + bar + " firstbar= " + firstbar + " lastbar= " +
> lastbar+ " se= "+ se;
>
>
>
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>


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