Cointégration

This Pine Script v6 indicator approximates cointegration between ES and NQ futures by calculating a dynamic beta (hedge ratio) using manual covariance and variance on closing prices over a user-defined lookback period. It computes a mean-reverting spread as ES - (beta * NQ), then normalizes it into a Z-score for divergence detection. The script plots the Z-score with customizable thresholds and triggers alerts for potential trades, like long ES/short NQ when Z-score drops below -2. Add it to an ES1! or NQ1! chart for visualization, but backtest thoroughly as it's not a full statistical test.