For shares, Eurostat decided to use the same formula as for proportions. This decision was taken to simplify calculations. Eurostat performed an analysis which showed that there are no significant differences between the standard errors obtained using the formula for proportions and the standard errors obtained using the formula for ratios (see section "Ratios", sub-section "Variance estimation in IFS and FSS for European aggregates").
Where:
is the VARPROP at country level (REGION=”COUNTRY”), for the same combination of dimension values as the EU aggregate in question. For example, if the line of the EU aggregate has dimensions FARMTYPE=”FT23_SO”, SO_EUR=”KE15-24”, AGRAREA=”HA5-9”, then the formula includes the 27 VARPROPs corresponding to the lines where REGION=”COUNTRY”, FARMTYPE=”FT23_SO”, SO_EUR=”KE15-24”, AGRAREA=”HA5-9”.
is the TOTAL_WGT at country level (REGION=”COUNTRY”), for the same combination of dimension values as the EU aggregate in question. For example, if the line of the EU aggregate has dimensions FARMTYPE=”FT23_SO”, SO_EUR=”KE15-24”, AGRAREA=”HA5-9”, then the formula includes the 27 TOTAL_WGTs corresponding to the lines where REGION=”COUNTRY”, FARMTYPE=”FT23_SO”, SO_EUR=”KE15-24”, AGRAREA=”HA5-9”.
