Beta
Beta is the regression slope of an asset’s return on a factor (usually the market) — a hedge ratio, not a destiny.
Definition
Beta refers to a hedge ratio, not a destiny. Keep that definition fixed when comparing series, managers, or regimes — renaming the same tape does not create a new signal.
Why it matters
It shows up in factor research, attribution, and capacity debates — whether a return slice is skill, style, or fee drag. When a hedge ratio, not a destiny shifts, related hedges, limits, and narratives usually need an explicit update rather than a quiet assumption.
Case
Suppose a desk is positioned for the opposite of what beta is saying. If a hedge ratio, not a destiny moves against that book, the first question is not “is the story clever?” but whether size, hedges, and stop logic still match the observation.
How to read it
Check definition stability across universes, costs, and regimes before treating a backtest as portable. Prefer a short written null hypothesis for Beta: what would falsify the current reading in the next window?
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