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 | |
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 |