Models | Epidemiology | Evolution | Number parameters | AIC | |||

H1N1 | α ≠1ρ_{winter} & ρ_{summer} | Seasonal forcing | Loss of immunityw_{ε} ≠ 0 | Transmissionw_{β} ≠ 0 | |||

Basic | × | × | Periodic splines | × | × | 14 | 4493 |

Basic-H1 | √ | × | Periodic splines | × | × | 17 | 4478 |

Refined | √ | √ | Periodic splines | × | × | 19 | 4471 |

Humidity | √ | √ | Specific humidity | × | × | 15 | 4484 |

Immunity loss/transmission | √ | √ | Periodic splines | √ | √ | 22 | 4450 |

Transmission | √ | √ | Periodic splines | × | √ | 21 | 4458 |

Immunity loss (continuous) | √ | √ | Periodic splines | √ | × | 21 | 4448 |

Immunity loss (cluster) | √ | √ | Periodic splines | √ | × | 20 | 4445 |