Regionalizing national-level growth projections in the Visegrad Countries – The issue of ex-post rescaling

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Páger, Balázs
Zsibók, Zsuzsanna
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Regional economic inequalities in the countries of the Visegrad Group appear to be persistent in the long run, and many empirical studies suggest that their further increase is expected, at least in the medium run. Our study provides empirical results with a methodological focus concerning the longterm prediction of regional economic growth in the Visegrad countries. Our method delivers subnational gross domestic product projections in a spatial downscaling approach according to which a selected national-level predicted growth path is downscaled to the regional level. In order to keep the regional results consistent with the national-level prediction, an ex-post proportional rescaling is needed which assures that the regional GDP values sum up to the projected national-level aggregate. This article examines the issues emerging from the practice of ex-post rescaling and uses out-ofsample tests on historical data sets to analyse the consequences of various methodological options. Taking into account the pros and cons, our study argues for the usefulness of ex-post rescaling in the case of the regional GDP downscaling in the Visegrad countries.
visegrádi országok , regionális gazdaságfejlődés - visegrádi országok , regionális fejlődés - visegrádi országok
Romanian Journal of Regional Science 14:(1) pp. 1-23. (2020)