Parameter | Coefficient | Acronym | |
---|---|---|---|

${k}_{1,\theta ,t}^{p}$ |
β
_{
j,t,2}
| Sea.flu | Google search index for seasonal flu terms |

${k}_{2,\theta ,t}^{p}$ |
β
_{
j,t,3}
| Symp | Google search index for symptoms |

${k}_{3,\theta ,t}^{p}$ |
β
_{
j,t,4}
| Med | Google search index for medications |

${k}_{4,\theta ,t}^{p}$ |
β
_{
j,t,5}
| Non-flu | Google search index for non-flu terms |

${k}_{1,\phi ,t}^{p}$ |
α
_{
j,t,2}
| Total | HealthMap total number of alerts |

${k}_{2,\phi ,t}^{p}$ |
α
_{
j,t,3}
| Unique | HealthMap number of unique alerts |

${k}_{3,\phi ,t}^{p}$ |
α
_{
j,t,4}
| HCF | HealthMap number of healthcare facilities related alerts |

${k}_{4,\phi ,t}^{p}$ |
α
_{
j,t,5}
| %RSV | Lab surveillance% RSV tested positive |

${k}_{5,\phi ,t}^{p}$ |
α
_{
j,t,6}
| Authority | Google search index for authority |

${k}_{6,\phi ,t}^{p}$ |
α
_{
j,t,7}
| Pan.flu | Google search index for pandemic flu terms |

${k}_{1,t}^{\mathit{np}}$ |
ρ
_{
s,j,t,2}
| Non-flu Index | Avian influenza, bird flu, common cold, severe acute respiratory syndrome (SARS), pneumococcus,% RSV |

${k}_{2,t}^{\mathit{np}}$ |
ρ
_{
s,j,t,3}
| Illness Index | body temp,% RSV, cough, fever, nasal congestion, cough relief remedies, headache, common cold, pediatric, paediatric |

${k}_{3,t}^{\mathit{np}}$ |
ρ
_{
s,j,t,4}
| Public-awareness Index | CHP, Hospital Authority, Ministry of Health, disinfect, flu, influenza, pandemic, epidemic, school closures, total number of HealthMap alerts, number of healthcare facilities related alerts, number of school related alerts, number of “breaking” alerts |