relative incidence vs incidence

relative incidence and incidence both are nouns.

Word	Noun	Adjective	Verb	Adverb
relative incidence	Yes	No	No	No
incidence	Yes	No	No	No

As nouns, relative incidence and incidence are synonyms defined as:

relative incidence and incidence: the relative frequency of occurrence of something

relative incidence (noun)	incidence (noun)
the relative frequency of occurrence of something	the striking of a light beam on a surface
	the relative frequency of occurrence of something