weight | Linguistic scale for the importance |

1 | Two factors are equally important |

3 | Compare one factor with the other, one is weakly important than the other |

5 | Compare one factor with the other, one is obviously important than the other |

7 | Compare one-factor t with the other, one is strongly important than the other |

9 | Compare one factor with the other, one is extremely important than the other |

2, 4, 6, 8 | Median value between neighboring factors |

reciprocal | a |