The Relative Strength Index (RSI) is typically calculated using a period parameter, which determines the number of data points to consider when computing the indicator. The period is often set to 14 by default, but it can be adjusted based on your trading strategy and the frequency of data.
In general, to calculate the RSI properly, you need a sufficient amount of historical price data covering at least the specified period. For example, if you're using a period of 14, you would ideally have at least 14 data points (e.g., closing prices) to compute the RSI accurately. However, having more data points can provide a better representation of market trends and improve the reliability of the RSI signal.
Keep in mind that the effectiveness of the RSI indicator can vary depending on market conditions, trading intervals (e.g., daily, hourly, or minute intervals), and the asset being analyzed. It's essential to backtest your trading strategy using historical data to determine the optimal parameters for your RSI calculations and to validate its performance before deploying it in live trading environments.