Agilent Technologies 7500 ICP-MS Operator's Manual page 632

Agilent 7500 ICP-MS ChemStation Operator's Manual
Appendix
2
3 y = ax + bx
⎛ ⎞ ⎛
∑ ∑
3
⎜ ⎟ ⎜
x w
i i
⎝ ⎠ ⎝
i
=
a -----------------------------------------------------------------------------------------------------------
⎛
∑
3
⎜
x
i
⎝
i
∑
–
x y w
i i i
=
i
b ----------------------------------------------- -
∑
2
x
i
i
2
4 y = ax + bx + c
–
s s
( )
( 2 )
xx
x y
=
a ---------------------------------------------------
–
s s
( )
( )
xx 2 2
x x
–
s s
( )
xy ( 2 2 )
x x
=
b ------------------------------------------------------ -
s s
( )
( 2 2 )
xx
x x
∑
∑
y w
i i
= –
i
---------------- -
c ---------------- - b
n
A-16
⎞ ⎛
∑
2
⎟ – ⎜
x y w x w
i i i i
⎠ ⎝
i i
⎞ ⎛ ⎞ ⎛
2
∑ ∑
2
⎟ ⎜ ⎟ ⎜
–
w x w
i i i
⎠ ⎝ ⎠ ⎝
i
∑
3
a x w
i i
i
w
i
s s
( )
( 2 )
xy
xx
{ }
2
s
( )
2
xx
s s
( 2 ) ( 2 )
x y xx
{ } 2
–
s
( 2 )
xx
∑
2
x w x w
i i i i
i – i
---------------- -
a
n n
⎞ ⎛ ⎞
∑
2
⎟ ⎜ ⎟
x y w
i i i i
⎠ ⎝ ⎠
i
⎞
4
⎟
x w
i i
⎠
i