Page 509 - niengiam2021

The index of industrial inventory is the index comparing the rate

of industrial inventory between reference time and base time. The
base time of the index of industrial inventory are the change in
inventory of base year (average of the beginning and the end of 2010),
the previous period and the same period of last year.

The index of industrial inventory reflects the situation of
changing in industrial inventory of each commodity, groups of
commodities, VSIC 4-digit industry, VSIC 2-digit industry and whole
manufacturing.

The index of industrial shipment is calculated for only enterprise
sector, not individual sector.

Calculation

The process of calculation is done in 4 steps:

- Step 1: Calculating inventory index of each commodity

Formula:

q
i Kn  Kn 1  100
q Kn 0

iKn : Inventory index of commodity n.

qKn1: Quantity of inventory commodity n at reference time.

qKn0: Quantity of inventory commodity n at base time.

- Step 2: Calculating inventory index of VSIC 4-digit industries

Formula:

i
I KN 4   Kn h Kn
h
 Kn
IKN4: Inventory index of VSIC 4-digit industry.

th
iKn : Inventory index of commodity n in VSIC 4-digit
industries.

hKn: Weight of commodity n.

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