2015/03/16 by Chiara Corini, Corini, Chiara, Guglielmo D'Amico +7
Economics, Econometrics and Finance · Physics and Astronomy · #Atmospheric and Oceanic Physics (physics.ao-ph) #Data Analysis #FOS: Economics and business #FOS: Physical sciences #General Finance (q-fin.GN) #Statistics and Probability (physics.data-an) #physics.ao-ph #physics.data-an #q-fin.GN
paper · pdf · doi:10.48550/arxiv.1503.05127
arxiv created 2015/03/16 · arxiv updated 2015/03/18
We propose a statistical approach to tornadoes modeling for predicting and simulating occurrences of tornadoes and accumulated cost distributions over a time interval. This is achieved by modeling the tornadoes intensity, measured with the Fujita scale, as a stochastic process. Since the Fujita scale divides tornadoes intensity into six states, it is possible to model the tornadoes intensity by using Markov and semi-Markov models. We demonstrate that the semi-Markov approach is able to reproduce the duration effect that is detected in tornadoes occurrence. The superiority of the semi-Markov model as compared to the Markov chain model is also affirmed by means of a statistical test of hypothesis. As an application we compute the expected value and the variance of the costs generated by the tornadoes over a given time interval in a given area. he paper contributes to the literature by demonstrating that semi-Markov models represent an effective tool for physical analysis of tornadoes as well as for the estimation of the economic damages to human things.