User Tools

Site Tools


z_score

평균이 0, 표준편차가 1인 정상분포에서의 개인점수를 말한다.

\begin{equation} 
\displaystyle z = \frac {X - \mu} {\sigma}}
\end{equation}

in R, pnorm(zscore) or pnorm(sd)

pnorm(1) - pnorm(-1)
pnorm(2) - pnorm(-2)
pnorm(3) - pnorm(-3)
> pnorm(1) - pnorm(-1)
[1] 0.6826895
> pnorm(2) - pnorm(-2)
[1] 0.9544997
> pnorm(3) - pnorm(-3)
[1] 0.9973002

in R, qnorm(percentage)

qnorm(.025)
qnorm(.975)
qnorm(0.025) 
qnorm(0.975) 

qnorm(0.01)
qnorm(0.99)

qnorm(0.001)
qnorm(0.999)
z_score.txt · Last modified: 2019/09/23 11:26 by hkimscil