Testing of industrial products - Aggregates for construction
Precision values obtained from the cross-testing experiments on the Fragmentation Dynamique test
Note. For all the tables here, "stragglers" have been included in the calculations, and "outliers" have been excluded.
Table 1. Repeatability and reproducibility (FD units).
| | Level 1 | Level 2 | Level 3 |
|---|
| Number of laboratories included |
N | 19 | 19 | 19 |
|---|
| Average |
X | 9.7 | 23.3 | 32.1 |
|---|
| Repeatability standard deviation |
Sr1 | 0.60 | 0.55 | 1.08 |
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| Reproducibility standard deviation |
SR1 | 1.53 | 2.47 | 2.44 |
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| Repeatability limit |
r1 | 1.7 | 1.5 | 3.0 |
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| Reproducibility limit |
R1 | 4.3 | 6.9 | 6.8 |
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Table 2. Functional relations (FD units).
| Functional relation |
|---|
| Repeatability standard deviation |
Sr1 = 0.41 + 0.015 X |
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| Reproducibility standard deviation |
SR1 = 1.12 + 0.048 X |
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| Repeatability limit |
r1 = 1.14 + 0.043 X |
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| Reproducibility limit |
R1 = 3.14 + 0.134 X |
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Table 3. Repeatability and reproducibility standard deviations expressed as coefficients of variation.
| | Level 1 | Level 2 | Level 3 |
|---|
| Repeatability coefficient of variation |
Cr1 | 6.2 | 2.4 | 3.4 |
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| Reproducibility coefficient of variation |
CR1 | 15.8 | 10.6 | 7.6 |
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Table 4. Sensitivity ratios.
| Level 2 - Level 1 |
Level 3 - Level 2 | Level 3 - Level 1 |
|---|
| Repeatability |
16.7 | 7.3 | 18.1 |
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| Reproducibility |
4.7 | 2.5 | 7.8 |
|---|