Stochastic Momentum Index

The Stochastic Momentum Index indicator is an advanced oscillator designed to measure the distance of the current closing price relative to the center of the recent high/low range, providing a cleaner and more responsive momentum signal than traditional stochastics.

Usage

The Usage of the Stochastic Momentum Index (SMI) primarily involves identifying trend reversals and momentum shifts through overbought/oversold levels and signal line crossovers.

• Overbought/Oversold: When the SMI rises above the overbought level (default +40), the asset may be overextended to the upside. Conversely, falling below the oversold level (default -40) suggests an overextended downside.
• Signal Crossovers: Traders often look for the SMI line to cross its signal line. A cross above the signal line indicates bullish momentum, while a cross below indicates bearish momentum.
• Trend Identification: The relationship between the SMI and the zero line or its signal line helps in determining the strength and direction of the prevailing trend.

Details

This tool is based on William Blau's implementation as detailed in "Technical Analysis of Stocks & Commodities." Unlike the standard Stochastic Oscillator, which calculates where the price is relative to the low of the range, the SMI calculates where the price is relative to the midpoint of the range. This results in an oscillator that fluctuates between -100 and +100, generally appearing smoother and more indicative of true momentum.

The script utilizes double-smoothed exponential moving averages to calculate the numerator and denominator of the index, reducing noise while maintaining sensitivity to price action.

Settings

• %K Length: Sets the lookback period for determining the highest high and lowest low range.
• %K Smoothing Length: The first smoothing period applied to the price relative to the range.
• %K Double Smoothing Length: The second smoothing period applied to provide a cleaner output.
• Signal Length: The period used to calculate the signal line.
• Signal MA Type: Selects the moving average method for the signal line (SMA, EMA, WMA, TRIMA, HMA, DEMA, TEMA, or ZLEMA).
• Overbought Level: The upper threshold used to identify potential overbought conditions.
• Oversold Level: The lower threshold used to identify potential oversold conditions.

FAQ

How do I interpret the SMI crossing the zero line?

A cross above zero suggests the price is trading in the upper half of its recent range, while a cross below zero suggests it is in the lower half, indicating a shift in momentum bias.

What is the advantage of using different Signal MA types?

Different moving averages like the HMA or ZLEMA can reduce lag compared to a standard SMA, allowing for faster crossover signals at the expense of potential false signals.

How can I access this tool?

You can get access on the LuxAlgo Library for charting platforms like TradingView, MetaTrader (MT4/MT5), and NinjaTrader for free.