This article is set within the framework of studies focusing on the impact of the SARS-CoV-2 virus on the dynamics of economic activity. For the purposes of the analysis of the expectations expressed in business tendency surveys, the paper aims to verify whether the pandemic of 2020-2022 can be...

The purpose of this paper is an attempt to nowcast (here: to predict in a short time horizon) new car registrations in Poland based on data of Google search queries and website traffic of car manufacturers. The study covers 47 monthly observations for six automotive makes. The strongest...

Based on search queries data and a macroeconomic index (PMI) we attempt to predict new car registrations. As the forecasting horizon is short, the modelling is performed in accordance with the idea of nowcasting. The study covers 48 monthly observations for sixteen car producers present on...

Importance of acknowledging data revisions – that is, corrections published after the initial announcement was made – has been repeatedly stressed in current economic literature. In this paper, I propose to test whether including information on data revisions infuences results of regression...

Data revision is defined as an adjustment published after the initial announcement had been made; it may reflect rectification of errors, availability of new information, etc. When economists use a database, they may not even be aware that some of the values have been revised, perhaps repeatedly,...

This paper evaluates information content of survey data by the means of entropy and dissimilarity measures. Similarities between a priori information (expectations) and a posteriori information (realizations) are assessed for four variables originating from Polish business tendency survey and...

Opracowanie prezentuje wyniki zastosowania empirycznej miary entropii rozkładu prawdopodobieństwa w celu oceny zawartości informacyjnej danych pochodzących z testu koniunktury Instytutu Rozwoju Gospodarczego SGH. Miary entropii wyznaczane są dla realizacji i oczekiwań wyrażanych w teście...

Rationality of economic agents belongs to the basic assumptions of neoclassical economic theory, and for decades it has inspired research on whether expectations are indeed formed rationally. Direct data on expectations are available mainly through business tendency surveys which are subject to...