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You are here: Home / Methods / Prices / Consumer Price Index / Methodology Documents

Methodology Documents

Key Methodological Documents

Introduction of Updated Series (Base December 2023=100)

CSO Consumer Price Index Methodology

Comparison Between the CPI and the HICP

Frequently Asked Questions

How to Calculate a Percentage Change

Weights

Compliance, Monitoring and Quality

Special Topics

Methodology Update to House Insurance

Change in Methodology for International Package Holidays

Methodology change for Computers and Printers

CPI Technical Paper - Methodology Change for Clothing, Footwear and Travel Goods

Methodology Change for Motor Insurance

Historical CPI Methodological Documents

Package Holidays - The Seasonal Basket Approach (PDF 48KB)

Research and Analysis

Notice of Change in Methodology for Clothing, Footwear and Travel Goods

Other Historical Publications