Manually calculated EMA isn't the same as in WL

Author: Panache

Creation Date: 11/1/2019 12:40 AM

Wealth Lab » Technical Indicators » Manually calculated EMA isn't the same as in WL

Panache

11/1/2019 12:40 AM

NEVER MIND. A FRIEND ANSWERED MY QUESTION FOR ME.

To make a long story short, I wrote a script to manually calculate the EMA:

CODE:
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If I understand the WIKI correctly, this should be exactly the way EMA.Series is calculated. However, when I run this on the symbol REZI for all data, I get a substantial (1.6%) difference between my EMA and the Wealth-Lab value.

Please tell me what is wrong with the way I am calculating my EMA. WEALTH-LAB CALCULATES THE EMA AS FOLLOWS, IE. BY WEIGHTING THE FIRST BAR AT 1 INSTEAD OF K:

CODE:
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NEVER MIND.  A FRIEND ANSWERED MY QUESTION FOR ME.

To make a long story short, I wrote a script to manually calculate the EMA:
[code]using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using WealthLab;
using WealthLab.Indicators;

namespace WealthLab.Strategies
{
	public class MyStrategy11 : WealthScript
	{
		protected override void Execute()
		{
			double periods = 100;
			double myEMA = 0;
			double k = 2 / (periods + 1);
			for (int bar = 0; bar < Bars.Count; bar++)
			{
				myEMA = k * (Close[bar] - myEMA) + myEMA;
			}
			DataSeries wlEMA = EMA.Series(Close, Convert.ToInt32(periods), EMACalculation.Modern);
			PrintDebug(wlEMA[Bars.Count - 1] + "  " + myEMA + "  " + ((wlEMA[Bars.Count - 1] - myEMA) / Close[Bars.Count - 1] * 100) + "%");
		}
	}
[/code]
If I understand the WIKI correctly, this should be exactly the way EMA.Series is calculated.  However, when I run this on the symbol REZI for all data, I get a substantial (1.6%) difference between my EMA and the Wealth-Lab value.

Please tell me what is wrong with the way I am calculating my EMA.  WEALTH-LAB CALCULATES THE EMA AS FOLLOWS, IE. BY WEIGHTING THE FIRST BAR AT 1 INSTEAD OF K:[code]using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using WealthLab;
using WealthLab.Indicators;

namespace WealthLab.Strategies
{
	public class MyStrategy14 : WealthScript
	{
		protected override void Execute()
		{
			double periods = 100;
			double myEMA = Close[0];
			double k = 2 / (periods + 1);
			for (int bar = 1; bar < Bars.Count; bar++)
			{
				myEMA = k * (Close[bar] - myEMA) + myEMA;
			}

DataSeries wlEMA = EMA.Series(Close, Convert.ToInt32(periods), EMACalculation.Modern);
				PrintDebug(Bars.Symbol + "  " + wlEMA[Bars.Count - 1] + "  " + myEMA + "  " + (wlEMA[Bars.Count - 1] - myEMA) + "  " + ((wlEMA[Bars.Count - 1] - myEMA) / Close[Bars.Count - 1] * 100) + "%");
		}
	}
}[/code]