Learning DATALINK

표준정규분포에서의 4분위의 4분위수와 100분위수

분위수표준정규분포 4분위
$\text{1/4분위}$$\text{2/4분위}$$\text{3/4분위}$$\text{4/4분위}$
4분위수$\text{1/4분위수} \approx -0.67449$$\text{2/4분위수} = 0$$\text{3/4분위수} \approx 0.67449$$\text{4/4분위수} =  \infty $
100분위수$\text{25/100분위수} \approx -0.67449$$\text{50/100분위수} = 0$$\text{75/100분위수} \approx 0.67449$$\text{100/100분위수} = \infty$

 

정규분포에서의 4분위의 4분위수와 100분위수

분위수정규분포 4분위
$\text{1/4분위}$$\text{2/4분위}$$\text{3/4분위}$$\text{4/4분위}$
4분위수$\text{1/4분위수} =\mu −2 \text{erfc}^{−1}(\frac{1}{2})\sigma$$\text{2/4분위수} = \mu$$\text{75/100분위수} =\mu +2 \text{erfc}^{−1}(\frac{1}{2})\sigma$$\text{4/4분위수} = \infty $
100분위수$\text{25/100분위수} =\mu −2 \text{erfc}^{−1}(\frac{1}{2})\sigma$$\text{50/100분위수} = \mu$$\text{75/100분위수} =\mu +2 \text{erfc}^{−1}(\frac{1}{2})\sigma$$\text{100/100분위수} = \infty$