| Id |
Subject |
Object |
Predicate |
Lexical cue |
| T50 |
0-263 |
Sentence |
denotes |
To control for country/region-specific observation biases, we included the length of time (measured in days) since the first confirmed COVID-19 case in each country/region and the number of COVID-19 tests conducted (as a measure of sampling effort) as covariates. |
| T51 |
264-549 |
Sentence |
denotes |
In addition, we applied the trend surface method to take spatial autocorrelation into account as a covariate; we added the first eigenvector of the geo-distance matrix among the countries or regions, which was computed using the geocoordinates of the largest city, as a covariate [16]. |
| T52 |
550-649 |
Sentence |
denotes |
The explanatory power of the model was evaluated by the adjusted coefficient of determination (R2). |
| T53 |
650-893 |
Sentence |
denotes |
We also calculated the relative importance of each explanatory variable in a regression model according to its partial coefficient of determination and determined the predominant variables that explained the variance in the response variables. |
| T54 |
894-976 |
Sentence |
denotes |
The statistical significance of each variable was determined by conducting F-test. |
| T55 |
977-1092 |
Sentence |
denotes |
All the explanatory variables were standardized to have a mean of zero and a variance of one before these analyses. |
| T56 |
1093-1186 |
Sentence |
denotes |
The explanatory factors of the regression model were compared between the four country types. |
