What is the RSI?
The Relative Strength Index (RSI) is a momentum oscillator used in technical analysis that measures the magnitude of recent price changes to evaluate overbought or oversold conditions in the price of a stock or other asset. Developed by Welles Wilder, it ranges from 0 to 100. It's a leading indicator, meaning it attempts to predict future price movements based on historical data. Understanding RSI can help traders identify potential reversals and confirm trends.
How it Works
RSI calculates the average gains and losses over a specified period, typically 14 periods (days, hours, etc.). It then determines the relative strength (RS) by dividing the average gain by the average loss. This RS value is then converted into an RSI value using a smoothing formula. Higher RSI values suggest strong buying pressure, while lower values indicate strong selling pressure.
Trading Signals
Generally, an RSI above 70 is considered overbought, suggesting a potential sell signal. Conversely, an RSI below 30 is considered oversold, hinting at a possible buy signal. However, these levels aren't foolproof. Divergences – where price makes new highs but RSI doesn't – can signal weakening momentum and potential reversals. Look for confirmation with other indicators.
Basic Settings
The default RSI period is 14, but traders often adjust it based on their trading style and the asset being analyzed. Shorter periods (e.g., 9) are more sensitive to price changes, generating more signals, while longer periods (e.g., 21) are smoother and less prone to false signals. Experiment with different settings to find what works best for you. This is for educational purposes only, not financial advice.