Common use of Statistical validations Clause in Contracts

Statistical validations. The sets of repeats of measured or computed mfdd for each tyre should be examined for normality, drift, eventual outliers. The consistency of the arithmetic means 𝑎̅ and corrected sample standard deviations 𝜎𝑎 of successive braking tests of SRTT14 should be examined. In addition and in order to take in account possible test evolution, the coefficient of validation CVala(SRTT) is calculated on the basis of the average values of any two consecutive groups of the minimum 6 runs of the Standard Reference Test Tyre according to 𝐶𝑉𝑎𝑙𝑎 (SRTT) = 100% × | 𝑎̅̅̅𝑅̅2̅ − ̅𝑎̅̅𝑅̅1̅ | 𝑎̅̅̅𝑅̅1̅ The coefficient of validation CVala (SRTT) shall not differ by more than 5 per cent. The coefficient of variation CVa, as defined in paragraph 3.1.1. of this annex, of any braking test shall be less than 6 per cent. If those conditions are not met, tests shall be performed again after re- grooming the test course." Appendix 2, amend to read: "Part 1 – Report …

Statistical validations. The sets of repeats of measured or computed mfdd for each tyre should be examined for normality, drift, eventual outliers. The consistency of the arithmetic means 𝑎̅ and corrected sample standard deviations 𝜎𝑎 of successive braking tests of SRTTSRTT 14 should be examined. In addition and in order to take in account possible test evolution, the coefficient of validation CVala(SRTT) is calculated on the basis of the average values of any two consecutive groups of the minimum 6 runs of the Standard Reference Test Tyre according to 𝐶𝑉𝑎𝑙𝑎 (SRTT) = 100% × | 𝑎̅̅̅𝑅̅2̅ − ̅𝑎̅̅𝑅̅1̅ | 𝑎̅̅̅𝑅̅1̅ The coefficient of validation CVala (SRTT) shall not differ by more than 5 per cent. The coefficient of variation CVa, as defined in paragraph 3.1.1. of this annex, of any braking test shall be less than 6 per cent. If those conditions are not met, tests shall be performed again after re- grooming the test course." Appendix 2, amend to read: "Part 1 – Report …

Statistical validations. The sets of repeats of measured or computed mfdd for each tyre should be examined for normality, drift, eventual outliers. The consistency of the arithmetic means 𝑎̅̅ and corrected sample standard deviations 𝜎𝑎 of successive braking tests of SRTTSRTT 14 should be examined. In addition and in order to take in account possible test evolution, the coefficient of validation CVala(SRTT) is calculated on the basis of the average values of any two consecutive groups of the minimum 6 runs of the Standard Reference Test Tyre according to 𝐶��𝑎𝑙𝑎 (SRTT) = 100% × | �̅̅̅̅2̅ �̅̅̅𝑅̅2̅ −̅̅̅̅1̅ ̅𝑎̅̅𝑅̅1̅̅̅̅̅1̅ | 𝑎̅̅̅𝑅̅1̅ The coefficient of validation CVala (SRTT) shall not differ by more than 5 per cent. The coefficient of variation CVa, as defined in paragraph 3.1.1. of this annex, of any braking test shall be less than 6 per cent. If those conditions are not met, tests shall be performed again after re- grooming the test course." Appendix 2, amend to read: "Part 1 – Report …

Statistical validations. The sets of repeats of measured or computed mfdd for each tyre should be examined for normality, drift, eventual outliers. The consistency of the arithmetic means 𝑎̅□ and corrected sample standard deviations 𝜎□□𝑎 of successive braking tests of SRTTSRTT 14 should be examined. In addition and in order to take in account possible test evolution, the coefficient of validation CVala(SRTT) is calculated on the basis of the average values of any two consecutive groups of the minimum 6 runs of the Standard Reference Test Tyre according to 𝐶𝑉𝑎𝑙𝑎 (SRTT) = 100% × | 𝑎̅̅̅𝑅̅2̅ − ̅𝑎̅̅𝑅̅1̅□□□□□657□7 □□□□□ □□□□ □□ □ □T†W†□ □ □ □□ | 𝑎̅̅̅𝑅̅1̅ The coefficient of validation CVala (SRTT) shall not differ by more than 5 per cent. The coefficient of variation CVa, as defined in paragraph 3.1.1. of this annex, of any braking test shall be less than 6 per cent. If those conditions are not met, tests shall be performed again after re- grooming the test course." Appendix 2, amend to read: "Part 1 – Report …