Table 1.
Data selection of the classification models.
| Data | Features | USEE1 | USEE2 | USEE3 |
|---|---|---|---|---|
| Baidu search index | 38 | Regional/National | Regional/National | Regional/National |
| Baidu migration index | 2 | Regional | Regional | Regional |
| Baidu information index | 8 | – | Regional/National | Regional/National |
| TikTok composite index | 8 | – | – | National |
| Stock sector index | 14 | – | – | National |
“Regional” represents regional Internet data, “national” represents national Internet data, and “regional/national” represents the ratio of regional and national Internet data. USEE under-sampling synchronous evolutionary ensemble. Affected by data sources and characteristics, the Baidu migration index can only choose regional data, and the TikTok composite index and stock index can only choose national data.