Producer price indices volume 2002, Supplement 2
Measuring Underlying Inflation in MEI
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- 2.5 Zone estimates of CPI in the MEI
2.4 Measuring Underlying Inflation in MEI
As mentioned above in Part 2.2, the OECD compiles a measure of underlying inflation that excludes from the all items index the prices of energy and food items. The series for all items, food, energy and underlying inflation (all items non-food non-energy) are presented for various groupings of countries in the CPI subject page in Part 1 of the MEI. These series are also shown for nearly all 20 More detailed information about HICPs can be found on the Eurostat website at http://europa.eu.int/comm/eurostat/newcronos/info/notmeth/en/theme1/euroind/cp/cp.htm . See also The European Union Harmonised Indices of Consumer Prices, J. Astin from Statistical Journal of the United Nations Economic Commission for Europe Volume 16, 1999, pages 123-135. MEI Methodological Analysis - Supplement 2 © 2002 22 countries in the country pages in Part 2 of the MEI. In recent years, it had become increasingly difficult to collect the detailed information required to estimate both the energy series and the underlying inflation series owing to the lack of consistency between national definitions of energy. However, since November 2001, both the energy and food series published in MEI are, for most OECD Member countries, based on a Classification of Individual Consumption by Purpose (COICOP) definition. Thus, these series and the underlying inflation series follow a common definition. However, there are a number of exclusions and attention should be paid to the use of proxy series as outlined in MEI metadata when users undertake analysis of area totals. 21 2.5 Zone estimates of CPI in the MEI In addition to information on national measures of price change, the OECD compiles estimates of price changes for a number of zones, namely the G7, EU15, Euro area, OECD Europe and OECD Total. In addition, two zones are adjusted to exclude the effect of countries that, owing to their high inflation relative to other Member countries have a substantial impact on the zone estimates in which they are included. These zones are “OECD Europe excluding high inflation countries” and “OECD Total excluding high inflation countries”. 22 The estimates are compiled by aggregating the national CPI indices in each period using estimates of Household Private Final Consumption Expenditure (HFCE) as weights. The HFCE for each country is converted into a common currency (US dollars) using Purchasing Power Parities (PPPs) which are rates of currency conversion that eliminate the differences in price levels between countries. The PPP used in the zone estimates relate specifically to HFCE and are not the same as the PPP for GDP, which are more commonly available. The weights used to compile the zone estimates are updated each year, usually in the July edition of MEI. Owing to the process of updating weights resulting from changes in the underlying national accounts data, the zone estimates are subject to revision even though national CPIs are rarely revised themselves. The main reason for updating the weights annually as opposed to aggregating with weights from a particular base year is to allow for the changing importance of a country within a zone over time. More specifically, the zone indices estimated in MEI are chain-linked Laspeyres indices, though only at the highest level of aggregation. This type of index is calculated in a two-stage process where each sub-index during one particular year of the index, say 1998, is re-referenced so that 1997=100 and then aggregated using the weights from the previous year, i.e. 1997 in this example. This forms a single link of length one-year. Next, each link is joined together to create a smooth time series back to a common year, currently 1995=100. Since weights are usually available with some time lag (around one year), estimates of the zone for the latest periods continue to use the most recently available weights until new data are available. 21 The target series for food is “food and non-alcoholic beverages” defined as COICOP 01. This excludes restaurant meals as well as alcoholic beverages, tobacco and other narcotics. The target series for energy incorporates the COICOP classification for “electricity, gas and other fuels” (COICOP 04.5) and the COICOP classification for “fuel and lubricants for personal transport equipment” (COICOP 07.2.2). Any exceptions are highlighted in MEI. 22 The high inflation countries are Hungary, Mexico, Poland and Turkey. |
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