Autocorrelation of Returns
Autocorrelation refers to the degree of correlation between the current value of a series and its past values. In financial markets, positive autocorrelation suggests that price trends tend to persist, while negative autocorrelation suggests mean reversion.
In cryptocurrency markets, autocorrelation is often influenced by order flow imbalances, market maker activity, and the herd behavior of retail participants. When returns are autocorrelated, the assumption of independent and identically distributed returns ⎊ a core requirement for many standard risk models ⎊ is violated.
This can lead to the systematic underestimation of risk, as traders may fail to account for the momentum or mean-reverting tendencies inherent in the market. Identifying these patterns is a key component of quantitative finance, as it allows traders to build models that better reflect the actual structure of price discovery.