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CPI Manual

CPI Manual Current status and results from the survey
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Title: CPI Manual 1
  • CPI Manual
  • Current status and results from the survey
  • 2 Survey on the usefulness of the Manual
  • Purposes
  • to obtain users feedback on the manual and identifying issues requiring further clarification for the future revisions of the electronic version of the manual,
  • to identify areas on which future Supplementary Handbooks may be needed,
  • to provide input for future meetings on CPI.
  • 3 Access to the printed and electronic version of the CPI Manual 4 Assessment of the four main purposes of the CPI ManualCompilers Users 5 Extent to which the Manual meets the needs Compilers Users 6 Q.Which of the following statements about the manual do you agree with? 7 How useful do you consider the following chapters of the manual (1)? 8 How useful do you consider the following chapters of the manual (2)? 9 In which of these areas would you find it useful that the manual provide more/ better practical examples (1)? 10 In which of these areas would you find it useful that the manual provide more/ better practical examples (2)? 11 Suggestions for specific issues to be dealt in Supplementary Handbooks
  • Net price indexes, core inflation indices
  • Housing indices
  • Insurance
  • CPI precision and related sampling/statistical issues
  • Compiling expenditure weights and their quality
  • HBS using diaries
  • Quality adjustment methods using hedonics which are feasible to use
  • Method of aggregation, choice of formula for calculating elementary indices between geometric and arithmetic mean
  • Indicators of quality of CPI
  • Integration of ICP and CPI
  • 12 Suggestions for possible additions (1)
  • overview of steps necessary to compile a CPI
  • a more detailed discussion on how to organize the price initiation and how to obtain relevant price observations that are based on detailed specifications
  • implication of the main use of the index on the coverageas a deflator and short-term indicator.
  • circumstances under which non-random sampling could be useful
  • example on determining optimum sample size and sampling variance estimation
  • links between sampling and quality adjustment
  • fixed and variable weights
  • 13 Suggestions for possible additions (2)
  • examples on treatment of specific products like mobile phones, and pricing of services
  • new methods of data collection, scanner data
  • further detail on the differences between time of acquisition, time of payment and time of consumption of services
  • treatment of price cuts (e.g. buy 2 get 1 free, discount coupons, special price discounts during non-peak hours)
  • examples on the change in prices of goods and serviced previously provided for free
  • monitoring the price movements in parallel markets (legal and illegal), controlled or subsidized prices
  • more details on linking time series
  • 14 Criticisms, comments on the CPI Manual
  • The CPI Manual provides good theoretical and methodological background for CPI. However, it would be very useful for CPI compilers to have more practical guidelines and examples on how to treat difficult areas or implement methods recommended in the Manual. The guidelines should be written in simpler phrases understandable for ordinary CPI compilers, especially for those whose native language is not English.
  • Too theoretical and academic in tone and content. Not enough detail on the real problems faced by compilers in the real world. many chapters in the manual would be of very limited use to compilers in the less developed countries.
  • The manual is sometimes oriented to readers that are already acquainted to CPI problems and to CPI literature. The manual is perhaps not that easy to grasp by someone that starts compiling a CPI.
  • 15 Method to optimize the allocation of price observations on product groups or elementary aggregates
  • The following factors are considered regarding the number of prices observed
  • weight in total expenditure
  • variance of prices and price volatility
  • geographical distribution of outlets and cost of data collection.
  • 16 (No Transcript) 17 Do you apply an automatic statistical procedure (or filtering) for checking prices? 18 Do you apply automatic methods for checking price changes by the magnitude of their impact on elementary or higher-level indices?
  • All price observations resulting in a change in the relevant monthly elementary index of more than x- are flagged
  • Elementary Aggregates are sorted by their contribution (to the all-item index), and checked.
  • All the positive and negative movements, at each level of index construction, are sorted and checked.
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