A B C D E F G H I J K L M N O P Q R S T U V W X Y Z  

Precision Level DCF Precision Level DCF

Where reference is made to precision/confidence level the following distinction shall apply:

Level 0:  

Precision of parameter is less than for 'level 1' ie parameter cannot be estimated within precision of plus or minus 40 % for a 95 % confidence interval and the coefficient of variation (CV) is higher than 20 %

Level 1:  

Level making it possible to estimate a parameter either with a precision of plus or minus 40 % for a 95 % confidence level or a coefficient of variation (CV) of 20 % used as an approximation;

Level 2:  

Level making it possible to estimate a parameter either with a precision of plus or minus 25 % for a 95 % confidence level or a coefficient of variation (CV) of 12,5 % used as an approximation;

Level 3:  

Level making it possible to estimate a parameter either with a precision of plus or minus 5 % for a 95 % confidence level or a coefficient of variation (CV) of 2,5 % used as an approximation.

Level 4:  

Level making: exhaustive data collection.

NR  

Not Relevant. It is not possible to provide a meaningful calculation of the precision - eg. because the variance is too large.

NA  

Not Applicable. There is no obligation to estimate precision for this parameter.

 

Coefficient of variation (CV) is preferred when applicable (Accuracy indicator).