How Does the Stochastic Indicator Work? A Beginner's Guide to Overbought & Oversold Signals in Pine Script v6
The Stochastic Oscillator is one of the most widely used momentum indicators in technical analysis, designed to measure where the current closing price sits relative to the high-low range over a specified lookback period. By normalizing price into a 0–100 scale, it provides a mathematically consistent framework for identifying when an asset may be statistically extended — either to the upside (overbought) or downside (oversold). This guide walks through the mathematics, the Pine Script v6 implementation, and the key parameters that govern its behavior. 1. The Mathematics Behind the Stochastic Oscillator The Stochastic Oscillator was developed by George Lane and is built on a straightforward normalization formula. The core value, called %K , answers the question: "Where does today's close fall within the recent price range?" The formula for %K is: $$\%K = \frac{\text{Close} - \text{Lowest Low}(n)}{\text{Highest High}(n) -...