GlossaryAdvanced
Statistical Arbitrage
A trading strategy that uses statistical relationships between assets to identify and trade temporary pricing divergences expected to revert.
Statistical arbitrage uses statistical relationships — such as historical correlation — between two or more assets to identify when their prices have temporarily diverged from their typical relationship, trading on the expectation that the relationship will eventually revert.
Unlike pure arbitrage (see Kaavon's "Arbitrage" glossary definition), which captures a mathematically certain price inconsistency, statistical arbitrage relies on a historical pattern continuing to hold — a genuinely uncertain assumption that can fail if the underlying relationship between the assets structurally changes.
Examples
- A statistical arbitrage strategy might trade two historically correlated assets whenever their price ratio diverges unusually far from its typical historical range.
- Unlike pure arbitrage, statistical arbitrage carries real risk, since the historical relationship it depends on isn't guaranteed to hold going forward.