Malgorzata Latuszynska, Ph., D., Institute of IT in Management, University of Szczecin, Mickiewicza 64, Szczecin, 71 101, Poland and Mariusz Borawski, Ph., D., Faculty of Information Science, Technical University of Szczecin, Zolnierska 49, Szczecin, 71-211, Poland.
The data used in an economic research is often characterized by uncertainty. The data uncertainty degree is a very important factor determining reliability and usability of the research results. The data uncertainty is described by laws of mathematical statistics. Generalizing the notion of a distribution and a variance we can create a numerical set with elements governed by laws of both algebra and statistics during arithmetic operation execution. The paper will describe uncertainty calculus based on this numerical set and show examples of applications in econometric and simulation models.