relative frequency

English Thesaurus

1. the ratio of the number of observations in a statistical category to the total number of observations (noun.linkdef)

hypernym	:	ratio,
definition	:	the relative magnitudes of two quantities (usually expressed as a quotient) (noun.linkdef)

hyponym	:	incidence, relative incidence,
definition	:	the relative frequency of occurrence of something (noun.linkdef)