Forecasting the cumulative number of confirmed cases of COVID-19 in Italy, UK and USA using fractional nonlinear grey Bernoulli model

被引:79
|
作者
Sahin, Utkucan [1 ]
Sahin, Tezcan [2 ]
机构
[1] Mugla Sitki Kocman Univ, Fac Technol, Dept Energy Syst Engn, TR-48000 Mugla, Turkey
[2] Mugla Sitki Kocman Univ, Fac Hlth Sci, Dept Hlth Management, TR-48000 Mugla, Turkey
关键词
COVID-19; Italy; UK; USA; Forecasting; Fractional grey model; ENERGY-CONSUMPTION; SYSTEM MODEL; EMISSIONS;
D O I
10.1016/j.chaos.2020.109948
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
Since the new coronavirus (COVID-19) outbreak spread from China to other countries, it has been a curiosity for how and how long the number of cases will increase. This study aims to forecast the number of confirmed cases of COVID-19 in Italy, the United Kingdom (UK) and the United States of America (USA). In this study, grey model (GM(1,1)), nonlinear grey Bernoulli model (NGBM(1,1)) and fractional nonlinear grey Bernoulli model (FANGBM(1,1)) are compared for the prediction. Therefore, grey prediction models, especially the fractional accumulated grey model, are used for the first time in this topic and it is believed that this study fills the gap in the literature. This model is applied to predict the data for the period 19/03-22/04/2020 (35 days) and forecast the data for the period 23/04-22/05/2020. The number of cases of COVID-19 in these countries are handled cumulatively. The prediction performance of the models is measured by the calculation of root mean square error (RMSE), mean absolute percentage error (MAPE) and R-2 values. It is obtained that FANGBM(1,1) gives the highest prediction performance with having the lowest RMSE and MAPE values and the highest R-2 values for these countries. Results show that the cumulative number of cases for Italy, UK and USA is forecasted to be about 233000, 189000 and 1160000, respectively, on May 22, 2020 which corresponds to the average daily rate is 0.80%, 1.19% and 1.13%, respectively, from 22/04/2020 to 22/05/2020. The FANGBM(1,1) presents that the cumulative number of cases of COVID-19 increases at a diminishing rate from 23/04/2020 to 22/05/2020 for these countries. (C) 2020 Elsevier Ltd. All rights reserved.
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页数:7
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