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Table 3 Notations for our model

From: Estimating the daily trend in the size of the COVID-19 infected population in Wuhan

Notation Meaning State Reference
Tt The reported number of confirmed cases outside Hubei province on Day t Known Official websites
It The observed number of imported cases on Day t Known Official websites
Lt The observed number of local cases on Day t Known Official websites
Ut The number of cases with no information on Day t Known Ut = Tt − It − Lt
xt The number of imported cases on Day t Estimated  
Xt The cumulative number of imported cases by Day t Estimated \( {X}_t={\sum}_{k=1}^t{x}_k \)
Nt The cumulative number of cases that should be confirmed in Wuhan by Day t Estimated  
t0 The date of infection for the very first case Estimated  
p The daily probability of departing from Wuhan Known [7, 8]
d The time from infection to detection Known [9]
tc The time when Nt increases at the fastest rate Known From our data
r A parameter that determines the growth rate of Nt Known [3]
K The size of the population that are susceptible to COVID-19 in Wuhan. Estimated