Australian Bureau of Statistics

Rate the ABS website
ABS Home > Statistics > By Catalogue Number
6401.0.55.003 - Seasonal Adjustment of Consumer Price Indexes, 2011  
Latest ISSUE Released at 11:30 AM (CANBERRA TIME) 14/09/2011  First Issue
   Page tools: Print Print Page Print all pages in this productPrint All RSS Feed RSS Bookmark and Share Search this Product

BACKGROUND


1.1 The ABS first compiled the CPI in 1960 with series extending back to the September quarter 1948. The CPI measures quarterly changes in the price of a basket of goods and services, which accounts for a high proportion of expenditure by the CPI population group (i.e. metropolitan households). This basket covers a wide range of goods and services.

1.2 The movements in prices measured each quarter reflect a range of influences. Some users wish to focus on components or a subset of these influences. Analysts use a variety of measures, including seasonal adjustment, exclusion measures (eg. CPI excluding fuel) and statistical measures such as the Trimmed mean and Weighted median to undertake analysis of inflation in the Australian economy. Seasonal adjustment helps the analysis of price movements as it estimates and then removes influences that are systematic and calendar related from a time series.

1.3 The ABS produces two measures of underlying trend inflation, the Trimmed mean and Weighted median. In the 15th series these measures were calculated using a seasonal adjustment methodology developed by the RBA (Roberts, 2005). The 16th series CPI review recommended the ABS continue to produce analytical measures of underlying trend inflation, but replace the 15th series seasonal adjustment methodology with standard ABS seasonal adjustment methodology. This will ensure seasonally adjusted CPI data is consistent with other ABS data and results in more transparent and robust analytical series.

1.4 The following analytical measures will be published in the September quarter 2011 issue of Consumer Price Index, Australia (cat. no. 6401.0), scheduled for release on 26 October 2011:

    • All groups CPI, seasonally adjusted; comprises all components included in the All groups CPI, seasonally adjusted where seasonality has been identified at the weighted average of eight capital cities level.
    • CPI Expenditure classes, seasonally adjusted; comprises the subset of seasonally adjusted expenditure classes at the weighted average of eight capital cities level.
    • Trimmed mean and Weighted median; these are two analytical measures of underlying trend inflation. For more details see Chapter 5.

Bookmark and Share. Opens in a new window

Commonwealth of Australia 2014

Unless otherwise noted, content on this website is licensed under a Creative Commons Attribution 2.5 Australia Licence together with any terms, conditions and exclusions as set out in the website Copyright notice. For permission to do anything beyond the scope of this licence and copyright terms contact us.