# Commission Implementing Decision of 27 June 2013 on the approval of the Valeo Efficient Generation Alternator as an innovative technology for reducing CO2 emissions from passenger cars pursuant to Regulation (EC) No 443/2009 of the European Parliament and of the Council (Text with EEA relevance) (2013/341/EU) (repealed), Division 5: Standard deviation of the arithmetic mean value of the efficiency of the alternator

Extent: E+W+S+N.I.

Statistical errors in the outcomes of the testing methodology caused by the measurements are to be quantified. The format of the error value is to be a standard deviation being equivalent to a two-sided confidence interval of 84 % (see formula (3)).
Formula (3) s x – = ∑ i = 1 n x i − x – 2 n n − 1
Where:
s x – standard deviation of arithmetic mean;
xi measurement value;
x – arithmetic mean;
n number of measurements
All measurements are to be performed consecutively at least five (5) times. For each speed the standard deviation is calculated.
The standard deviation of the efficiency value of the alternator (ΔηΑ) is calculated by the following formula:
Formula (4) Δη Α = 0,25 * S 1800 2 + 0,40 * S 3000 2 + 0,25 * S 6000 2 + 0,1 * S 10000 2
Where the values 0,25, 0,40, 0,25, and 0,1 are the same weighting values as in formula (2) and S1 800, S3 000, S6 000, and S10 000 are the standard deviations calculated with formula (3).

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Source: https://www.legislation.gov.uk/eudn/2013/341/annex/division/5 (the official version)
Page: https://openlegislation.uk/eu-decision-2013-341/annex/division-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.