A quadratic trend-based time series method to analyze the early incidence pattern of COVID-19
Abstract
The ongoing pandemic of Coronavirus disease has already affected more than 300,000 people. In this study, we propose an appropriate auto-regressive integrated moving-average model with time-varying parameters to analyze the trend pattern of the early incidence of COVID-19 outbreak, and subsequently, estimate the basic reproduction number for different countries. We also incorporate information on total or partial lockdown into the model. The model is concise and flexible in structure. For...