12
r sxy
( )
vs.
2023 11-12 — 2024-01-18 – p.25/30
Slide 26
Slide 26 text
Pearson r ( sx sy x y )
r =
sxy
sx
sy
=
n
i=1
(xi
− ¯
x)(yi
− ¯
y)
n
i=1
(xi
− ¯
x)2
n
i=1
(yi
− ¯
y)2
r −1 +1 |r| 1 ( )
sxy
sxy
=
n
i=1
(xi
− ¯
x)(yi
− ¯
y)
n − 1
t ( df = n − 2 t ; )
t = r
n − 2
1 − r2
2023 11-12 — 2024-01-18 – p.26/30