1 , the time series plots of COVID-19 confirmed rates for the 8 selected countries and the world show that they are not stationary and depict a decreasing trend after around 15 March 2020, while after around 15 August 2020, the COVID-19 confirmed rate of European Union countries (France, Germany, Italy and Spain) displays an increasing trend compared to the others when compared to the previous COVID-19 pandemic period.
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Nonlinear models: a case of the COVID-19 confirmed rates in top 8 worst affected countries.
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