Trying to determine Slope of Regression Channel

[squarewave]

I am using regression channel, with a period of 128, and width of 2.5

I simply trying to calculate if the slope of the channel is either up or down.

In the screenshot, even though the slope is up, but the code below is producing a negative value of -0.08384 which is indicating the slope is negative/down:
double mySlope = ( Slope(RegressionChannel(128,2.5), 127, 0) );

Also, the following code should be grabbing the value of the regression channel middle line @ 127 bars ago:
RegressionChannel(128,2.5).Middle[127];

I visualized the "slope" by drawing as a magenta colored line. Instead of duplicating the middle orange line, it draws a completely different line with a contradictory slope.

What am I doing wrong? How can I get the value for the middle line @ 127 bars ago?

        //Add your custom strategy logic here.
        if (CurrentBars[0] < 128) return;


        // --------------------------------------------------
        // Draw Regression Channel on Chart
        // --------------------------------------------------

        // https://ninjatrader.com/support/helpGuides/nt8/NT%20HelpGuide%20English.html?regressionchannel.htm
        // https://ninjatrader.com/support/helpGuides/nt8/NT%20HelpGuide%20English.html?draw_regressionchannel.htm

        NinjaTrader.NinjaScript.DrawingTools.RegressionChannel myRegChan = Draw.RegressionChannel(this, "myOuterChannel", false
            ,127, 0 // startBarsAgo = 127 (this matches 128), endBarsAgo = 0
            ,Brushes.Orange, DashStyleHelper.Solid , 1
            ,Brushes.Orange, DashStyleHelper.Solid , 1
            ,Brushes.Orange, DashStyleHelper.Solid , 1
            );

        // Define Channel Width
        myRegChan.StandardDeviationUpperDistance = 2.5;
        myRegChan.StandardDeviationLowerDistance = 2.5;


        // --------------------------------------------------
        // Regression Channels
        // --------------------------------------------------

        double PriceUpper = RegressionChannel(128,2.5).Upper[0];
        double PriceMiddle = RegressionChannel(128,2.5).Middle[0];
        double PriceBottom = RegressionChannel(128,2.5).Lower[0];


        // --------------------------------------------------
        // Determine Slope
        // --------------------------------------------------

        // https://ninjatrader.com/support/helpGuides/nt8/NT%20HelpGuide%20English.html?slope.htm
        // The "startBarsAgo" parameter MUST be greater than the "endBarsAgo" parameter
        double mySlope = ( Slope(RegressionChannel(128,2.5), 127, 0) );


        // --------------------------------------------------
        // Drawing the "Slope"
        // --------------------------------------------------

        // grabbing the value of Middle line @ 127 bars ago:
        double PriceMiddleRear = RegressionChannel(128,2.5).Middle[127];

        // drawing the slope as magenta colored line
        Draw.Line( this, "tag2", false, 127, PriceMiddleRear, 0, PriceMiddle, Brushes.Magenta, DashStyleHelper.Solid, 1);


        // --------------------------------------------------
        // Displaying Variables on Chart
        // --------------------------------------------------

        Draw.TextFixed(this, "myText"
            ,"\nPriceUpper:  " + PriceUpper
            + "\nPriceBottom: " + PriceBottom
            + "\n\nPriceMiddle:  " + PriceMiddle
            + "\nPriceMiddleRear: " + PriceMiddleRear
            + "\n\nmySlope: " + mySlope
            , TextPosition.TopRight
            );

[NinjaTrader_BrandonH]

Hello squarewave,

Thanks for your post.

I see that you are calling double mySlope = ( Slope(RegressionChannel(128,2.5), 127, 0) ); and you are calling double PriceMiddle = RegressionChannel(128,2.5).Middle[0]; in your script. To clarify, are you using the Regression Channel indicator or are you using the Regression Channel drawing tool?

To get the midline value from the Regression Channel indicator, the syntax below would be used and this syntax could be found in the RegressionChannel() help guide documentation.

Returns default midline value

RegressionChannel(int period, double width)[int barsAgo]
RegressionChannel(ISeries<double> input, int period, double width)[int barsAgo]

See this help guide page about RegressionChannel(): https://ninjatrader.com/support/help...on_channel.htm

It seems you are comparing a drawing tool on the chart to an indicator value being accessed in the strategy.

To confirm the RegressionChannel indicator value in the print matches the indicator value on the chart, you should be using AddChartIndicator() in the strategy script to plot the Regression Channel indicator on the chart for comparison.

Then, add prints to the script that print out the RegressionChannel() indicator value and compare the prints in the NinjaScript Output window to the indicator on the chart.

AddChartIndicator(): https://ninjatrader.com/support/help...indicator.htm?

Below is a link to a forum post that demonstrates how to use prints to understand behavior.
https://ninjatrader.com/support/foru...121#post791121

[squarewave]

I was attempting to calculate if regression channel slope is up or down.

I tried two different methods, both are not working.

1st method:
double mySlope = ( Slope(RegressionChannel(128,2.5), 127, 0) ); // this does not always accurately reflect the correct slope 100% of the time

2nd method:
would be comparing two values against each other using: RegressionChannel(intperiod,doublewidth)[intbarsAgo]
RegressionChannel(128,2.5)[0]
RegressionChannel(128,2.5)[127]

The problem is that RegressionChannel(128,2.5)[127] does not provide the correct value (as demonstrated by the magenta line)

[NinjaTrader_BrandonH]

Hello squarewave,

Thanks for your notes.

I have called AddChartIndicator() in a strategy to plot the RegressionChannel indicator on the chart window and added prints to the script that print out the RegressionChannel indicator values along with the CurrentBar value.

Then, I opened a Data Box window and compared the prints in the NinjaScript Output window to the RegressionChannel indicator's Middle plot and see the values are matching.

See the attached images demonstrating this.

To compare these values in your script, call AddChartIndicator() to add the RegressionChannel indicator to the chart from the strategy. Then, add prints to the script that prints out the RegressionChannel indicator values along with the CurrentBar. Compare the NinjaScript Output prints to the RegressionChannel indicator's Middle plot in the Data Box window.

AddChartIndicator(): https://ninjatrader.com/support/help...tindicator.htm
RegressionChannel(): https://ninjatrader.com/support/help...on_channel.htm
Data Box: https://ninjatrader.com/support/help...8/data_box.htm

Below is a link to a forum post that demonstrates how to use prints to understand behavior.
https://ninjatrader.com/support/foru...121#post791121

[squarewave]

AddChartIndicator() is irrelevant to my question, but I switched over to it so you will stop focusing on it.

AddChartIndicator( RegressionChannel(128,2.5) );

You are missing the actual issue I am having. I will try to be clarify my issue with better accuracy:

The value for Middle[127] is never accurate (see the attached photo "pink" dot)

The code I am using:

double Middle_0 = RegressionChannel(128,2.5).Middle[0]; // always outputs the correct value
double Middle_127 = RegressionChannel(128,2.5).Middle[127]; // always outputs the WRONG value!

// visualizing these values on the chart:
Draw.Dot( this, "middle_0", true, 0, Middle_0 , Brushes.Green );
Draw.Dot( this, "middle_127", true, 127, Middle_127 , Brushes.Magenta );
​

[NinjaTrader_BrandonH]

Hello squarewave,

Thanks for your notes.

The dot is actually being drawn correctly for this indicator. It is drawing based on the plot value, not the rendered lines that the indicator draws on the chart.

If you click the indicator so the plot gripper shows up, you can see that the dot is being drawn at the correct value.

See this demonstration video: https://brandonh-ninjatrader.tinytak...OF8yMjgxMTMzNQ

To be able to draw on the rendered line you would need to use the OnRender logic that it already has to find the Y value for the plot value and then convert that Y to a price which could be used with the dot.

To view the RegressionChannel indicator code, open a New > NinjaScript Editor window, open the Indicators folder, and double-click on the RegressionChannel file.

That may be difficult though since it uses two points for the line so you would have to do something similar to the YAxisProjectionOfLine example on the forum thread linked below where you calculate the intercept

YAxisProjectionOfLine: https://forum.ninjatrader.com/forum/...63#post1180063

[squarewave]

Thank you for help so far.

This is aggravating and does not make any sense.

The indicator I am calling is "Regression Channel". So why does it not return the channel value?

If I wanted linear regression, then I'd use the "lin. reg." indicator.

[NinjaTrader_BrandonH]

Hello squarewave,

Thanks for your notes.

This is how the RegressionChannel indicator was created to function. The indicator has three indicator plots for Middle, Upper, and Lower.

If we look at the code of the RegressionChannel indicator script, we can see that in OnBarUpdate() it calculates the linear regression parameters, then calculates the standard deviation of the residuals (vertical distances to the regression line), and assigns the calculated values to the plots in the script.

Then, the script uses OnRender() and SharpDX to custom render the three channel lines that you see on the chart window.

The channel lines on the chart are custom rendered objects on the chart and these are not the actual plots of the indicator.

To view the RegressionChannel indicator code, open a New > NinjaScript Editor window, open the Indicators folder, and double-click on the RegressionChannel file.