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qn1: Quantity produced of item n in the reference period;

qn0: Quantity produced of item n in the base period.

- Step 2: Calculating production index of VSIC 4-digit classes

The production index at 4-digit class of VSIC industry is the
weighted average index of indexes of items representing for such

VSIC 4-digit classes.
Formula:

i  W qn
 qn
I qN 4 
 W qn

Where:

IqN4: Production index for the N-th class of the VSIC 4-digit class;

Iqn: Production index for the n-th item in the VSIC 4-digit class;

Wqn: Weight of the item n. Weight of item is the value at basic
price of the item in the base year 2010.

- Step 3: Calculating production index of VSIC 2-digit
divisions

The production index at 2-digit division of VSIC industry is the

weighted average index of the production indices of VSIC 4-digit
classes under the VSIC 2-digit divisions.

Formula:

I 4  W qN 4
 qN
I qN 2   W qN 4

Where:

IqN2: Production index of the VSIC 2-digit divisions;

IqN4: Production index of the VSIC 4-digit classes;

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