Add upper and lower Standard Deviations to LinRegCurve

[OpaBert]

Below is the EFS for a LinRegCurve. It basically draws the mean/center LinReg for a given period.

The standard LinRegLine EFS draws an upper and lower line based on a varriable standard deviation input.

What I would like to add to the below EFS is an upper and lower curve based on a varriable standard deviation input and like the LinRegLines I'd like to be able to select curve thickness and color and have the option to remove the mean/center curve.

In effect what would be created is a curved channel + & - some StdDev based on the mean/center LinRegCurve.

I can use the wizard but this requires Editor talent that I do not have. I hope someone will find this modification usefull enough to post a revised EFS. Thanks in advance.


/************************************************** *****************
* Description : This Indicator plots the Linear Regression Curve
*
************************************************** ******************/

//Global Variables


var bInitialized = false;


function preMain()
{
setPriceStudy(true);
setStudyTitle("Linear Regression Curve");
setCursorLabelName("LR Curve");

// Number of Bars before signal is cancelled
var fp1 = new FunctionParameter( "frLength", FunctionParameter.NUMBER);
fp1.setName( "Length" );
fp1.setLowerLimit(0);
fp1.setDefault(20);

//Line thickness
var fp2 = new FunctionParameter( "LineThickness", FunctionParameter.NUMBER);
fp2.setName( "Line thickness" );
fp2.setLowerLimit( 1 );
fp2.setUpperLimit( 10 );
fp2.setDefault( 2 );

// Filter on Mean Swing Line
var fp3 = new FunctionParameter("LineColor", FunctionParameter.COLOR);
fp3.setName( "LineColor" );
fp3.setDefault(Color.navy);

// end of formula paramaters

}
function main(frLength,LineThickness,LineColor)
{
var len = frLength;
var vPrice = getValue("Close", 0, -len);
var Num1 = 0.0;
var Num2 = 0.0;
var SumBars = len * (len - 1) * 0.5;
var SumSqrBars = (len - 1) * len * (2 * len - 1) / 6;
var SumY = 0.0;
var Sum1 = 0.0;
var Sum2 = 0.0;
var Slope = 0.0;
var Intercept = 0.0;
var i = 0;

//script is initializing
if ( getBarState() == BARSTATE_ALLBARS ) {
return null;
}

//initialize once-only paramaters
if ( bInitialized == false ) {

setDefaultBarFgColor( LineColor, 0 );
setDefaultBarThickness( Math.round( LineThickness ), 0 );

bInitialized = true;
}

for (i = 0; i < len; i++)
{
SumY += vPrice[i];
Sum1 += i * vPrice[i];
}
Sum2 = SumBars * SumY;
Num1 = len * Sum1 - Sum2;
Num2 = SumBars * SumBars - len * SumSqrBars;
if (Num2 != 0) Slope = Num1 / Num2;
Intercept = (SumY - Slope * SumBars) / len;
var LinearRegValue = Intercept + Slope * (len - 1 );
return LinearRegValue;
}

[smlynnbo]

What you are looking for is already a built-in "Basic" study called Linear Regression.

[OpaBert]

LinReg Bands

The Basic LinReg does not maintain the history of the movement. It refreshes each time it is activated so it is not possible to see the true relationship at any bar on the chart.

My prior formula keeps the visual record of the mean line. I would also like to keep the selected standard deviations.