Table 2.
Optimal features for virological surveillance.
| Query | Query reference | Coefficient | ||
|
|
|
Lag-2 | Lag-1 | Lag 0 |
| (Intercept) |
|
–1.459 | –3.124 | –2.147 |
| A hyeong influenza [influenza A type] | Social media; query recommendation | 26.413 | 18.899 | 22.579 |
| A hyeong dokgam [ influenza A type] | Social media; query recommendation | 0 | 0 | 379.041 |
| B hyeong dokgam [ influenza B type] | Social media; query recommendation | 6.007 | 15.324 | 24.039 |
| B hyeong dokgamjeungsang [ symptoms of influenza B type] | Social media; query recommendation | 0 | 0 | 0.229 |
| Influenza A | Social media; query recommendation | 37.953 | 25.021 | 17.449 |
| Influenza ahyeong [influenza A type] | Social media; query recommendation | 24.114 | 19.342 | 11.426 |
| Gamgibaireoseu [cold virus] | Social media | 0 | 0 | 4.898 |
| Gamgi pparrinatneunbeop [how to cure flu quickly] | Query recommendation | 5.365 | 4.262 | 2.343 |
| Gamgiyebang [cold prevention] | Social media; query recommendation | 0 | 0 | –0.450 |
| Gamgiyebangbeop [how to prevent a cold] | Social media | –0.155 | –2.736 | –4.140 |
| Geongang [health] | Social media | 4.091 | 3.562 | 3.390 |
| Geunyuktong [muscle pain] | Social media; chief concern | 0 | 0 | –0.265 |
| Nalssi [weather] | Social media | 0 | 0 | –0.111 |
| Dokgam ahyeong [flu A type] | Social media; query recommendation | 0 | 0 | 22.772 |
| Dokgamgamyeom [flu infection] | Social media | 12.236 | 1.449 | 0 |
| Dokgamgeomsa [flu check] | Social media; query recommendation | 38.254 | 31.878 | 0 |
| Dokgam gyeokrigigan [flu isolation period] | Query recommendation | 0 | 0 | 12.145 |
| Dokgam goyeol [flu high fever] | Social media; chief concern | 0 | 0 | 1.745 |
| Dokgam gichim [flu cough] | Social media; chief concern | 0 | 0 | 25.911 |
| Dokgam noin [flu in the elderly] | Social media | 0 | 0 | –3.739 |
| Dokgam baireoseu [flu virus] | Social media; query recommendation | 0 | 0 | –0.777 |
| Dokgam i [flu child] | Social media | 0 | 0 | 2.694 |
| Dokgam eorini [flu child] | Social media | 0 | 0 | –0.477 |
| Dokgam yebang [flu prevention] | Social media; query recommendation | –2.467 | –9.760 | –12.191 |
| Dokgam yebanghaneunbangbeop [how to prevent flu] | Query recommendation | 0 | 0 | –0.638 |
| Dokgam yuhaeng [flu epidemic] | Social media; query recommendation | 0 | 0 | –0.109 |
| Dokgam ipwon [flu hospitalization] | Social media; query recommendation | 8.156 | 0 | 13.793 |
| Dokgam jeonyeom [flu infection] | Social media; query recommendation | 38.184 | 81.830 | 9.762 |
| Dokgam jeonpa [flu dissemination] | Social media; query recommendation | 2.596 | 5.613 | 3.973 |
| Dokgamjusa [flu injection] | Social media; query recommendation | –3.907 | 0 | 0 |
| Dokgamjuuibo [flu watch] | Query recommendation | 0.883 | 0.310 | 0 |
| Dokgam hakgyo [flu school] | Social media | 9.268 | 0 | 0 |
| Dokgam hapbyeongjeung [flu complication] | Social media | 0 | 0 | 3.513 |
| Dokgamhwanja [flu patient] | Social media | 7.024 | 5.027 | 3.205 |
| Dwaejidokgam [swine flu] | Query recommendation | 0.358 | 0 | 0 |
| Maseukeu [mask] | Social media | 8.053 | 0 | 0 |
| Momsal [body aches] | Social media; chief concern | 0 | 1.387 | 3.912 |
| Soa dokgam jeungsang [child flu symptoms] | Query recommendation | 4.737 | 8.058 | 9.041 |
| Adong dokgam jeungsang [child flu epidemic] | Social media; query recommendation | 0 | 0 | –5.273 |
| Eoreun dokgam jeungsang [adult flu symptoms] | Query recommendation | 5.156 | 1.485 | 0.610 |
| Eolgultongjeung [face pain] | Chief concern | –1.057 | 0 | 0 |
| Onmomi apeum [whole body pain] | Chief concern | 2.962 | 3.725 | 4.791 |
| Uisa [doctor] | Social media | –3.153 | –0.436 | –0.712 |
| inpeulruenja ahyeong [influenza A type] | Social media; query recommendation | 0 | 8.349 | 5.837 |
| Inpeulruenja samang [influenza death] | Social media; query recommendation | 0 | –0.363 | –5.193 |
| Inpeulruenja yak [influenza medicine] | Social media; query recommendation | 0 | 0 | –0.560 |
| Inpeulruenja jeungse [influenza symptoms] | Social media; query recommendation | 3.039 | 2.051 | 5.303 |
| Ipwon [hospitalization] | Social media | 0 | 0 | –0.213 |
| Joryudokgam [avian flu] | Query recommendation | 3.972 | 4.239 | 3.492 |
| Tamipeulru [Tamiflu] | Social media; query recommendation | 0 | 65.618 | 75.462 |
| Pyeryeom [pneumonia] | Social media; query recommendation; chief concern | 0 | 0 | –1.288 |
| Peulru [flu] | Seed keyword | 15.992 | 13.406 | 5.924 |
| Hwanja [patient] | Social media | –4.543 | –3.170 | –2.922 |