Revisions
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The PTCI revision policy allows for regular and systematic incorporation of new and revised data for the past reference periods, including regular benchmarking to the CSA. The revision policy serves to improve the reliability and accuracy of the PTCI time series estimates. It is adapted from the policy followed for the CSMA.
At the time of a PTCI release, estimates for the previous two years are subject to revision. These revisions allow for newly published SUTs as well as other macroeconomic data to be incorporated into the PTCI time series.
When a new CSA benchmark is produced and incorporated into the PTCI all estimates back to the last PTCSA benchmark year are revised. This window for revision in the PTCI varies according to the frequency of CSA updates.
From time to time comprehensive revisions to the CSA and PTCI are carried out. Comprehensive revisions provide an opportunity to introduce new concepts and definitions, implement new and refined methods and data sources, as well as revamp estimation systems. Comprehensive revisions typically result in changes to the entire PTCI time series.
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