베타 분포

베타 분포
확률 밀도 함수
누적 분포 함수
기호 Beta(α, β)
매개변수 α,β > 0
지지집합
확률 밀도
누적 분포
기댓값
(디감마함수)
중앙값
최빈값 (α, β >1)
분산
(폴리감마함수)
비대칭도
첨도
엔트로피
적률생성함수
특성함수 (초기하함수)

확률론통계학에서 베타 분포(Β分布, 영어: beta distribution)는 두 매개변수 에 따라 [0,1] 구간에서 정의되는 연속 확률 분포들의 가족이다.

확률 밀도 함수

베타 분포의 확률 밀도 함수는 다음과 같다.

여기서 감마 함수이다. 베타 함수 B(.,.)는 함수의 적분값이 1이 되도록 하기 위해 사용되었다.

응용

베타 분포는 다운링크 빔포밍 등에 쓰인다.

외부 링크

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