Manual on agricultural price Index numbers
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The main objective of this manual is to help countries in starting the construction of agricultural price indices, or improving the methodology of existing ones, if needed. It complements the manual: "Farm and Input Prices: Collection and Compilation" (FAO 1980), therefore the description of the collection, compilation, treatment and dissemination of price data are not repeated here. However, definitions of the basic categories of agricultural price statistics are provided, where appropriate, for convenience. In addition to the discussion of price indices, the text covers the concepts, computation and interpretation of certain derived indicators, such as the parity ratio and the terms of trade.
It is hoped that this publication will be a useful instrument for developing countries in the training of national staff as well as a practical reference for the statisticians in charge of index construction. It may also assist the data users in the interpreation and application of index numbers.