Select the method or formula of your
choice.

These statistics appear in the table that shows the effectiveness of the classification for the best and worst terminal nodes. In general, rows are in order by the size of the class probabilities. Values within 1E-12 are ties. Minitab sorts ties by their weighted counts. If the weighted counts are also ties, then Minitab sorts ties by the node ID.

The following formula gives the percent of the data that are in the node.
This formula is for data without weights:

The following formula is for data with weights:

Term | Description |
---|---|

number of cases in node
k | |

N | number of cases in the data set |

weight for the
j^{th} case in the node | |

weight for the
i^{th} case in the data set |

Minitab refers to event probability and non-event probability for
binary response variables.

The following formula gives the percent events in the node. This formula is
for data without weights:

The following formula is for data with weights:

The non-event probability has the following definition:

Term | Description |
---|---|

number of events in node
k | |

number of cases in node
k | |

weight for the
j^{th} event in the node | |

weight for the
i^{th} observation in the node |

Minitab refers to class probability and non-class probability for
multinomial response variables.

The following formula gives the percent for a class in the node. This
formula is for data without weights.

The following formula is for data with weights:

The non-class probability has the following definition:

Term | Description |
---|---|

number of cases in a class
y in node
k | |

number of cases in node
k | |

weight for the
j^{th} case in class
y in the node | |

weight for the
i^{th} case in the node |

The formula for odds depends on whether the response variable is binary or multinomial.