Znaczenie rewizji danych w procesie modelowania
The importance of data revision in the modeling process

Summary/Abstract: This study aims to present the new real-time set of macroeconomic data for the Polish economy constructed on the basis of the monthly Statistical Bulletins published by the Central Statistical Office. This dataset gives answers to many important questions on the revision processes which have an influence on the consistency of data as well as effects on attributes of econometric models and statistical inference. In particular, in this article methodological revisions were discussed and their types were specified. It is a base for the statistical analysis and verification of reasons of unexpected non-methodological revisions. The research indicates that in the significant group of variables revisions are systematic. This is a result of the error measurement reduction, not the accessibility of new information which has significant implications for modeling.

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