B: Altre informazioni sui calcoli 135
Statistiche
, ,
x
x
∑
n
-----=
y
y
∑
n
-----=
x
w
xy
∑
y
∑
--------=
Sx
x
2
∑
x
∑
()
2
n
------------–
n 1–
---------------------------=
Sy
y
2
∑
y
∑
()
2
n
------------–
n 1–
--------------------------=
σx
x
2
∑
x
∑
()
2
n
------------–
n
---------------------------=
σy
y
2
∑
y
∑
()
2
n
------------–
n
--------------------------=
r
xy
∑
x
∑
y
∑
n
-----------–
x
2
∑
x
∑
()
2
n
------------–
⎝⎠
⎛⎞
y
2
∑
y
∑
()
2
n
------------–
⎝⎠
⎛⎞
--------------------------------------------------------------------=
m
xy
∑
x
∑
y
∑
n
-----------–
x
2
∑
x
∑
()
2
n
------------–
--------------------------=
bymx–=
x
ˆ
yb–
m
-----------= y
ˆ
mx b+=
10B-050523-1.book Page 135 Friday, September 1, 2006 2:32 PM
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