Rule Building (Geospatial Association Rules)

Rule building parameters set the criteria for the generated association rules.

Items Per Rule

Number of field values that can be included in rule conditions and predictions. The total number of items cannot exceed 10. For example, in the rule "If x=1 and y=2, then z=3", there are two condition items and one prediction item.

Maximum predictions.

Maximum number of field values that can occur in the predictions for a rule.

Maximum conditions.

Maximum number of field values that can occur in the conditions for a rule.

Exclude Pair

Excludes the specified pairs of fields from being included in the same rule.

Rule Criteria

Confidence.

Minimum confidence a rule must have to be included in the output. Confidence is the percentage of correct predictions.

Rule Support.

Minimum rule support a rule must have to be included in the output. The value represents the percentage of cases for which the rule is true in the observed data. For example, if the rule is "If x=1 and y=2, then z=3," rule support is the actual percentage of cases in the data for which x=1, y=2, and z=3.

Condition Support.

Minimum condition support a rule must have to be included in the output. The value represents the percentage of cases for which the condition exists. For example, if the rule is "If x=1 and y=2, then z=3," condition support is the percentage of cases in the data for which x=1 and y=2.

Lift.

Minimum lift a rule must have to be included in the output. Lift is a measure of how much the rule improves prediction over random chance. It is the ratio of correct predictions to the overall occurrence of the predicted value. For example, if the predicted value occurs 20% of the time and the confidence in the prediction is 80%, then the lift value is 4.

Treat as same

Identifies pairs of fields that should be treated as the same field.