S430 User Manual
57
K
1
∑
A
i
C
i
1
n
∑
A
i
∙
∑
C
i
n
i1
n
i1
n
i1
∑
A
i
2
1
n
∑
A
i
n
i1
2
n
i1
K
0
∑
C
i
n
i1
n
K
1
∑
F
i
n
i1
n
6.2.2 Quadratic Working Curve (2nd order)
The calculation formula is as follow:
2
2
1
0
Where,
C: Concentration of standard sample
A : Abs. of each sample (measured value)
Kn are calculated by the least squares method
Suppose there are n data points(
A
n
，C
n
)，then：
K
2
SA
2
CS
AA
S
AC
SAA
2
S
AA
SA
2
A
2
SAA
2
2
（Formula F5-5）
K
1
S
AC
SA
2
A
2
SA
2
CSAA
2
S
AA
SA
2
A
2
SAA
2
2
（Formula F5-5）
K
0
∑
C
i
n
i1
n
K
1
∑
C
i
n
i1
n
K
2
∑
F
i
2
n
i1
n
（Formula F5-7）
6.2.3 The correlation coefficient
The correlation coefficient R represents how the regression curve fitting.
Suppose there are n data points
，
:
∑
1
∑
1
∙
∑
1
∑
2
1
∑
1
2
∑
2
1
∑
1
2
（Formula F5-13）
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