The equation for an Ema can be written as: EMA = α * Price + (1 - α) * EMA ; where EMA  is the value of the EMA one bar ago. Figure 1: zero lag ec (yellow) and ema (red) response to a step function. The SMA length is set to 12 and the gain limit is set to 50.
The EMA calculation formula works in such a way that the position of the indicator line is more affected by the most recent price formations on the chart.
Dec 11, 2013 · This system combines a relatively short EMA with the standard MACD to find market momentum. When the two indicators align, they show an impulse move. Dr. Alexander Elder advised that you should use the Impulse System on a higher time-frame to enhance the trading setup. Trading Rules – Impulse System Long Trading Setup. 13-period EMA rising
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This is a simple swing trading algorithm that uses a fast RSI-EMA to trigger buy/cover signals and a slow RSI-EMA to trigger sell/short signals for SPY, an xchange-traded fund for the S&P 500. The idea behind this strategy follows the premise that most profitable momentum trades usually occur during periods when price is trending up or down.