Division Formula 4

where:

The CO₂-emission correction coefficient $k_{{\mathrm{CO}}_2}$ shall be determined from a set of T measurements performed by the manufacturer, as defined in Regulation UN/ECE No 101, Annex 8. For each measurement, the electricity balance during the test and the measured CO₂-emissions shall be recorded.

In order to evaluate the statistical error of $k_{{\mathrm{CO}}_2}$ , all T combinations without repetitions of T-1 measurements has to be used to extrapolate T different values of $k_{{\mathrm{CO}}_2}$ (i.e. $k_{{\mathrm{CO}}_{2_t}}$ ). The extrapolation shall be performed according to the method defined in Regulation UN/ECE No 101, Annex 8.

The standard deviation of $k_{{\mathrm{CO}}_2}\left(S_{\stackrel{–}{k_{{\mathrm{CO}}_2}}}\right)$ is thus calculated as defined by Formula 5.