(finance) A measurement of the returns earned in excess of that which could have been earned on an investment that has no diversifiable risk, per unit of market risk assumed.

(statistics, medicine) A measure of the chance of an event in one group compared to that of another at a particular time or over a subset of a study's time; the ratio between two groups' hazard rates.

plural of hazard ratio

plural of Gini ratio

Synonym of Gini coefficient

plural of variation ratio

(geometry) A special number associated with an ordered quadruple of collinear points, particularly points on a projective line, and preserved by the fractional linear transformations.

(biology, sociology) The ratio of males to females in any given population.

(philosophy) “Right reason”, which regards virtue as desirable in itself.

In radioactivity, the portion of all decays that take a given pathway. For example, californium-252 decays by alpha decay ~97% of the time, and by spontaneous fission ~3% of the time; so the branching ratio is about 0.97 in favor of alpha decay, and about 0.03 in favor spontaneous fission.