Ⅷ Index Numbers of Commodity Prices in Agriculture

331
331
Ⅷ
Index Numbers of Commodity Prices in Agriculture
E x p l a na t i o n
This part shows the results of the "Index Numbers of Commodity Prices in Agriculture" released by the Statistics
Department of the Ministry of Agriculture, Forestry and Fisheries (hereafter MAFF).
The Statistics Department of MAFF has continually calculated and published since April 1948, having made
several revisions of base period and index items. In the revision for 2000 base, along with the discontinuation of the
index numbers of materials for daily life, the "price index to measure the economic trends in rural areas and price
level fluctuation" was replaced by the "price index to measure the price fluctuation in agricultural input and output",
and "Index numbers of commodity prices in rural areas" was also revised as "Index numbers of commodity prices in
agriculture". Index numbers of wages for temporary agricultural employees were discontinued in the revision for
2005 base. The calculation methods of the index numbers of commodity prices in agriculture are as follows:
1 Calculation methods of base year price and indices
The 2010 base Index has been calculated since July 2012.
When the revision for 2010 base was made, to enable comparison between new and old indices, the indices up
to 2009 were linked with the new indices (base year = 2010) multiplying the link coefficient derived from the
2010 indices (base year = 2005). This liking was made separately for all items, groups and items. Base year price
and other factors for calculating the indices are as follows:
(1) Base year price
Base year price is the annual average price of 2010, based on the results of the "Statistical Survey on
Commodity Prices in Agriculture". It is calculated as follows:
a Agricultural products
Firstly, each of the monthly national average prices of 2010 is calculated by the weighted average of the
monthly prefectural average prices, using shipment quantities of 2009 and 2010 as its weight.
Secondly, each of the yearly (annual) national average price is calculated by the weighted average of the thus
calculated monthly national average prices, using monthly national shipment quantities of 2009 and 2010 as its
weight.
b Materials for agricultural production.
Firstly, each of the monthly national average prices of 2010 is calculated by the simple average of the monthly
prefectural average prices.
Secondly, each of the yearly (annual) national average prices is calculated by the simple average of the
calculated monthly national average prices.
(2) Formula of indices
Laspeyres' formula is used
Ｉｔ＝ Index number of prices for all items and groups
Σ Ｗ o i ( 100×Ｐ t i / Ｐ o i ) Ｗ o i＝ Weight by commodity (product / material) in the base period
Ｉｔ＝
(2010 calendar year)
Σ Ｗ oi
Ｐ o i＝ Individual price in the base period (2010 calendar year)
Ｐ t i＝ Individual price in the current period
(3) Weights and item numbers are shown in the table of weights and item numbers of Index Numbers of
Commodity Prices in Agricultureare.
The calculation of index numbers for all items and groups of agricultural products had been used "Steady
combined weight method by item and by month", but since 2000 base, it has been used "Variable weight by item
by month" in which weight for each group is fixed and monthly weights of items are changed in line with
specific volume in the market, in order to properly reflect monthly price fluctuation.
2 Prices by commodity (product / material) and indices of each year
Prices by commodity (product / material) are calculated by each of the yearly national average prices and indices
in the same formula, as for the base year price (as described in 1 above).
330
330
農業物価指数のウエイト及び品目数表
Weights and item numbers of Index Numbers of Commodity Prices in
Agriculture
Group of items
ウエイト
Weights
品目数
Number of items
農産物
米
麦
雑
穀
豆
い
も
野
菜
果
実
工芸農作物
花
き
畜
産
物
稲
わ
ら
Agricultural products
Rice
Wheat and barley
Miscellaneous cereals
Pulses
Potatoes and sweet potatoes
Vegetables
Fruits
Industrial crops
Flowers
Livestock products
Rice straw
10,000
2,247
90
11
90
259
2,700
1,256
392
501
2,449
5
120
4
4
1
3
5
37
22
8
17
18
1
農業生産資材
種苗及び苗木
畜産用動物
肥
料
飼
料
農業薬剤
諸
材
料
光熱動力
農
機
具
自動車・同関係料金
建築資材
農用被服
賃借料及び料金
Materials for agricultural production
Seeds and seedlings
Livestock
Fertilizers
Feed
Agricultural chemicals
Miscellaneous materials
Light, heat and power
Agricultural implements
Automobiles and charges
Materials for building
Agricultural clothing
Rent and charges
10,000
525
440
1,070
1,701
887
378
928
2,072
578
392
32
997
141
17
11
16
13
20
9
7
21
4
9
5
9
種
別

Download Report