The Statistics Act specifies that the disseminating agencies cannot publish, or otherwise make available to any individual or organization, statistics that would enable the identification of data for any individual person or entity without prior consent.
The Statistics Act (Chapter 317) designates the Chief Statistician as the national statistical co-ordinator, responsible for developing national statistical standards and standardizing definitions, classifications, terms, procedures and concepts for use in statistical activities; and for promoting the observance of approved national statistical standards.
The data are made available 2 working days before release to the public, under strict embargo conditions, to the Ministry of Trade and Industry and Monetary Authority of Singapore for the preparation of the monthly inflation report.
The CPI is designed to measure the average price changes of a fixed basket of goods and services commonly purchased by the households over time. The methodology used in the compilation of CPI in Singapore complies closely with the recommendations by the International Labour Organisation (ILO) as well as other countries’ best practices, where appropriate.
Population coverage: Resident households. Resident households are defined as households headed by Singaporean Citizens or Permanent Residents.
Geographic coverage: Whole of Singapore.
Item coverage: Consumption expenditure incurred by resident households; non-consumption expenditure such as loan repayment, income taxes, purchase of housing, shares and other financial assets are excluded.
Timing of price observations: The frequency of data collection depends on the price behaviour of the item. Prices of perishable food items which are more volatile are collected weekly. Most prices are collected monthly, while items with more stable prices are surveyed quarterly, half-yearly or as and when the prices/rates change.
Types of prices: Transaction prices (including taxes) actually paid, except owner-occupied accommodation (based on imputed rental concept under the rental equivalent method); special offers and discount prices are considered if they are valid for a sufficiently long period and items are available in reasonable quantities.
Sources of weights: The weights for the current series are derived from the expenditure values collected in the Household Expenditure Survey (conducted between October 2012 and September 2013) and updated to 2014 values by taking into account price changes between the two periods.
Time period of current weights: 12 months from January to December 2014.
Frequency of weight updates: Every 5 years. The weighting pattern and the CPI basket of goods and services are revised once every five years to reflect the latest consumption pattern and composition of goods and services consumed by resident households.
Item selection: Items selected for pricing were those with relatively high weights. Those with relatively low weights were not selected and their weights were distributed to the selected akin items accordingly.
Outlet selection: Outlets selected were based on their market shares and covered a wide range of retailers and service providers commonly patronised by shoppers. Information on sales volume of the establishment was obtained from the Survey of Wholesale and Retail Trades to assist in the selection process.
Sample sizes: On average, price quotations of 6,600 brands/varieties are collected from 4,200 outlets
Price collection methods: Collected through a combination of data collection modes, i.e. visits by field interviewers, postal/email enquiries or websites.
Item/variety specification: The Singapore Department of Statistics supplies detailed specifications covering item characteristics such as brand, size, fabric/material, country of origin, etc. to price collectors and respondents for their collection and provision of price data.
Missing prices: If a product is temporarily unavailable, its price change is assumed to be the same as that of other similar products. If the product is permanently unavailable, a closest substitute will be sourced to replace it.
Quality differences: Prices are adjusted to remove the effect of quality changes, wherever possible.
Replacement varieties: Price collectors select product with significant market share and where possible with the same quality (quality in terms of previous product's characteristics; price collectors consult retailers on these issues).
New items: New products which are popular are added as and when the old ones are phased out.
Seasonal items: Seasonal items (such as seasonal fruits) are excluded.
Owner-occupied housing: Based on imputed rental concept under the rental equivalence method.
Verification procedures: Further clarifications made with respondents for large variations.
Seasonally adjusted indices: Seasonally adjusted indices are published at division level.
Methods used to combine basic price observations: The geometric mean formula is used in the computation of elementary aggregate price indices, wherever applicable.
Formula for aggregation: Base-weighted Laspeyres' formula.
Method used to update weights for price change: The price updated weights are calculated by multiplying the weights from the weight reference period by the price changes between weight and price reference period and rescaling to sum to unity.
Linking of historical series : The historical CPI data series are linked to the 2014-based CPI data series by re-scaling them to the new base year of 2014 via a link factor.
The quarterly Economic Survey of Singapore (QES) publishes time series for CPI and percentage change at division level as follows: (1) annual data for the latest 4 years; and (2) quarterly data for the latest 9 quarters.
The annual Economic Survey of Singapore (AES) publishes time series for CPI and percentage change at division level as follows: (1) annual data for the latest 4 years; and (2) quarterly data for the latest 8 quarters.
The Yearbook of
Statistics publishes: (1) CPI and year-on-year percentage change at
division level for general households for the latest 6 years; (2) CPI
and year-on-year percentage change at division level for households in the
lowest 20%, middle 60%, highest 20% income groups for the latest 3 years; and (3)
CPI for selected consumer items for the latest 7 years.
As a general practice, no revisions are made to CPI unless there are exceptional circumstances.
Details of the revision and rebasing of the CPI to reference year 2014 are published in an Information Paper entitled "Rebasing of the Consumer Price Index (Base Year 2014 = 100)". The public is notified of the revised indices through the release of a press statement.
The data are released simultaneously to all interested parties by issuing the press release Singapore Consumer Price Index (2014 =100), and are disseminated through the DOS website (http://www.singstat.gov.sg/news/news) at the same time.
A short note is also appended to the monthly press release Singapore Consumer Price Index (2014 =100) as well as the Monthly Report on Consumer Price Index.
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