Random Noise

Random noise in financial markets refers to the erratic, unpredictable, and meaningless fluctuations in price that do not follow a clear trend. It is the stochastic component that makes market prediction difficult, as it reflects the aggregate of all irrational or immediate events.

In technical and fundamental analysis, the goal is often to separate this noise from true signal. Pricing models explicitly incorporate this noise using diffusion coefficients and volatility parameters.

Understanding the nature of this noise is essential for avoiding "overfitting" a model to past data. Successful traders learn to ignore the noise and focus on statistically significant price movements.