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The novel Coronavirus disease (COVID-19) is a severe respiratory infection that officially occurred in Wuhan, China, in December 2019. In late February, the disease began to spread quickly across the world, causing serious health, social, and economic emergencies. This paper aims to forecast the short to medium-term incidence of COVID-19 epidemic through the medium of an autoregressive integrated moving average (ARIMA) model, applied to Italy, Russia, and the USA The analysis is performed on the number of new daily confirmed COVID-19 cases, collected by Worldometer website (www.worldometers.info/coronavirus/). The best ARIMA models were Italy (4,2,4), Russia (1,2,1), and the USA (6,2,3). The results showed that: i) ARIMA models are reliable enough when new daily cases begin to stabilize; ii) Italy, the USA, and Russia reached the peak of COVID-19 infections in mid-April, mid-May, and early June, respectively; and iii) Russia and the USA will require much more time than Italy to drop COVID-19 cases near zero. This may suggest the importance of the application of quick and effective lockdown measures, which have been relatively stricter in Italy. Therefore, even if the results should be interpreted with caution, ARIMA models seem to be a good tool that can help the health authorities to monitor the diffusion of the outbreak. Further useful and more precise forecasting may be provided by continuously updating these data, adding interventions and other real aspects, and applying the model to other countries and/or regions.

ARIMA forecasting of COVID-19 incidence in Italy, Russia, and the USA