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 1Level 2Level 3
Number of laboratories included N191919
Average X9.723.332.1
Repeatability standard deviation Sr10.600.551.08
Reproducibility standard deviation SR11.532.472.44
Repeatability limit r11.71.53.0
Reproducibility limit R14.36.96.8

Table 2. Functional relations (FD units).
Functional relation
Repeatability standard deviation Sr1 = 0.41 + 0.015 X
Reproducibility standard deviation SR1 = 1.12 + 0.048 X
Repeatability limit r1 = 1.14 + 0.043 X
Reproducibility limit R1 = 3.14 + 0.134 X

Table 3. Repeatability and reproducibility standard deviations expressed as coefficients of variation.
Level 1Level 2Level 3
Repeatability coefficient of variation Cr16.22.43.4
Reproducibility coefficient of variation CR115.810.67.6

Table 4. Sensitivity ratios.
Level 2 - Level 1 Level 3 - Level 2Level 3 - Level 1
Repeatability 16.77.318.1
Reproducibility 4.72.57.8