May 2021
Beginner to intermediate
380 pages
9h 22m
Korean
Content preview from 데이터 과학을 위한 통계(2판)
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151
3
장
통계적 실험과 유의성검정
3.9.2
카이제곱검정: 통계적 이론
점근적
asymptotic
통계 이론은 카이제곱통계량의 분포가
카이제곱분포
chi
-
square
distribution
로 근사화될
수 있음을 보여준다. 적절한 표준 카이제곱분포는
자유도
에 의해 결정된다(
3
.
7
절 참고). 분할
표에서 자유도는 다음과 같이 행 (
r
)과 열 (
c
)의 수와 관련이 있다.
자유도
=−
()
×−
()
rc11
카이제곱분포는 일반적으로 한쪽으로 기울어져 있고 오른쪽으로 긴 꼬리가 있다. 자유도가
1
,
2
,
5
,
10
인 경우의 분포는 [그림
3
-
7
]을 참고하자. 관찰된 통계량이 카이제곱분포의 바깥쪽에
위치할수록
p
값은 낮아진다.
그림
3-7
다양한 자유도에 따른 카이제곱분포
chisq
.
test
함수를 이용해 카이제곱분포에 대한
p
값을 계산할 수 있다.
> chisq.test(clicks, simulate.p.value=FALSE)
Pearson’s Chi-squared test
data: clicks
X-squared = 1.6659, df = 2, p-value = 0.4348
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.