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Fonterra Co-operative Group

Page 7

Figure 3: Linearity and residuals plots for vitamin D

2

linearity experiment 3

Table 3: Variance of vitamin D

3

back-calculated concentrations

Standard Number

Variance

(1)

(%)

Experiment 1

Experiment 2

Experiment 3

1

25.0

55.8

79.4

2

5.6

0.4

11.9

3

-1.0

-1.8

-3.5

4

-1.3

-5.2

-1.3

5

0.4

3.8

-0.3

6

-0.1

-1.1

0.2

(1)

Variance of back-calculated concentration from regression against actual concentrations

Figure 4: Linearity and residuals plots for vitamin D

3

linearity experiment 1

y = 0.8624x + 0.0137

R² = 0.9998

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

0.0

2.0

4.0

6.0

8.0

Peak Area Ratio

Concentration Ratio

Linearity: Vitamin D

2

5

th

Jan 2016

-0.1

-0.05

0

0.05

0.1

0.0

2.0

4.0

6.0

8.0

Residuals

XVariable

Residual Plot: Vitamin D

2

5

th

Jan 2016

y = 1.4247x - 0.0479

R² = 1

0

5

10

15

20

25

30

35

40

45

0.0

10.0

20.0

30.0

Peak Area Ratio

Concentration Ratio

Linearity: Vitamin D

3

28

th

Dec 2015

-0.2

-0.1

0

0.1

0.2

0.0

20.0

40.0

60.0

Residuals

XVariable

Residual Plot: Vitamin D

3

28

th

Dec

2015

VitD-18 (February 2016)

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