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2010-Base Explanation of the Consumer Price Index

March 2012
Ministry of Internal Affairs and Communications, Statistics Bureau

Contents

I Outline of the 2010-Base Consumer Price Index (PDF:448KB)

1 Characteristics of the index

........................................    1    

2 Outline of the index

........................................    1    

3 Index series available

........................................    2    

4 Publication of the CPI

........................................    4    

[Reference] Treatment of the housing services of owner-occupied houses

........................................    5    

II Outline of the 2010-Base Revision of the Consumer Price Index (PDF:448KB)

1 Introduction

........................................    6    

2 Aim of the revision

........................................    6    

3 Main points of the revision

........................................    6    

(Appendix) Index items revised for the 2010 base

........................................  11    

III Calculation of the Consumer Price Index

Chapter 1 Calculation of the prices in the observation period (Pt) (PDF:448KB)

1 Calculation of the prices in the observation period

........................................  13    

2 Substitution of the prices in the observation period

........................................  14    

Chapter 2 Quality adjustment during calculation of the prices in the observation period (PDF:448KB)

1 Necessity for quality adjustment of the prices in the observation period

........................................  15    

2 Method of quality adjustment

........................................  15    

Chapter 3 Calculation of the prices in the base period (P0) (PDF:448KB)

........................................  21    

Chapter 4 Calculation of the weight (W0) (PDF:448KB)

1 Scope of the Family Income and Expenditure Survey (FIES) items adopted for the weights

........................................  22    

2 Calculation of the weights for the basic classification indices

........................................  23    

3 Calculation of the weights for the goods and services classification

........................................  26    

4 Calculation of the weights for index based on baskets of specific household groups

........................................  26    

Chapter 5 Method of index calculation and the index series (PDF:448KB)

1 Index formula

........................................  28    

2 Process of the index calculation

........................................  28    

3 Process for the case when the prices in the observation period are not available

........................................  29    

4 Calculation of average indices for calendar year, fiscal year and so on

........................................  29    

5 Calculation of the rate of change

........................................  30    

6 Calculation of the contribution to the total change and the rate of contribution

........................................  30    

7 Index series

........................................  31    

Chapter 6 Linking of new and old indices (PDF:448KB)

1 Method of linking new and old indices

........................................  38    

2 Range for calculating linked indices

........................................  39    

3 Notice for the use of linked indices

........................................  41    

Chapter 7 Seasonal Adjustment (PDF:448KB)

1 Calculation method of seasonally adjusted indices

........................................  42    

2 Data used to calculate seasonally adjusted indices

........................................  42    

3 Recalculation of seasonally adjusted indices

........................................  42    

4 Available series of seasonally adjusted indices

........................................  42    

[Reference] Method of seasonal adjustment

........................................  43    

Appendix 1 Calculation of the price index for PCs and cameras by Hedonic approach (PDF:448KB)

........................................  44    

Appendix 2 Calculation method of model items (PDF:448KB)

........................................  46    

Appendix 3 Calculation of the weights for the imputed rent (PDF:448KB)

........................................  49    

Appendix 4 Calculation of the CPI by midpoint-year basket method (PDF:448KB)

........................................  57    

IV List of information for items of the 2010-Base Consumer Price Index (PDF:448KB)

........................................  60    

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