(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.

(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.

Synonym of Gini coefficient

(law) legal philosophy under which penal redress to crime should only be used as a measure of last resort

(film, television) The ratio between the total duration of footage created for possible use in a project and the duration used in the final cut.

(medicine) The ratio (MRD + MLD) / ID, where MRD is the greatest perpendicular diameter from midline to right heart border; MLD is the greatest perpendicular diameter from midline to left heart border; and ID is the internal diameter of the chest at the level of the right hemidiaphragm.

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.

Abbreviation of price-earnings ratio.

Alternative spelling of eudysmic ratio

Alternative form of S/F ratio