QQE Indicator / Quantitative Qualitative Estimation

Hi there, I am trying to write up an indicator but I am struggling at the psudo code for creating a new indicator which uses the PREVIOUS value combined with the CURRENT value:

AtrRsi = abs(RsiMa[1] - RsiMa)

MaAtrRsi = exponentialaverage[WildersPeriod](AtrRsi)

I need to do the above, but at initialization time, I do not know how to reference RsiMA[1] (the previous value)

Could someone point me to another indicator which does something similar?

Update Backtest

Hi Ian, 

The rolling window of indicator could help you get the previous value and the current value of the indicator, please see this example

I think I might have just spotted that the "Delay(1).Of" is what I'm looking for, perhaps. If not I'll look at the rolling window.


You have to wait till your indicator has all the past (previous) values before you can calculate the indicator value. In this post it looks like [1] means previous value.

In this sample you see that 3 data points are stored before calculating:

using MathNet.Numerics;
using QuantConnect.Indicators;
using System;
using System.Linq;

//Copied from this forum:

namespace QuantConnect.Algorithm.CSharp.Helpers
public class AnnualizedExponentialSlopeIndicator : WindowIndicator<IndicatorDataPoint>
public AnnualizedExponentialSlopeIndicator(int period)
: base("AESI(" + period + ")", period)

public AnnualizedExponentialSlopeIndicator(string name, int period)
: base(name, period)

protected override decimal ComputeNextValue(IReadOnlyWindow<IndicatorDataPoint> window, IndicatorDataPoint input)
if (window.Count < 3) return 0m;

var xVals = new double[window.Count];
var yVals = new double[window.Count];

// load input data for regression
for (int i = 0; i < window.Count; i++)
xVals[i] = i;
// we want the log of our y values
yVals[i] = Math.Log((double)window[window.Count - i - 1].Value);


// solves y=a + b*x via linear regression
var fit = Fit.Line(xVals, yVals);
var intercept = fit.Item1;
var slope = fit.Item2;

// compute rsquared
var rsquared = GoodnessOfFit.RSquared(xVals.Select(x => intercept + slope * x), yVals);

// anything this small can be viewed as flat
if (double.IsNaN(slope) || Math.Abs(slope) < 1e-25) return 0m;

// trading days per year for us equities
const int dayCount = 252;

// annualize dy/dt
var annualSlope = ((Math.Pow(Math.Exp(slope), dayCount)) - 1) * 100;

// scale with rsquared
//annualSlope = annualSlope * Math.Pow(rsquared, 2);
annualSlope = annualSlope * rsquared;

if (annualSlope >= (double)decimal.MaxValue || annualSlope <= (double)decimal.MinValue)
annualSlope = -1000;
//Debug("Negative slope due to arithmic overflow");

return Convert.ToDecimal(annualSlope);


Update Backtest


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