PREDICTION_PROBABILITY

Syntax

Description of the illustration prediction_probability.gif

mining_attribute_clause::=

Description of the illustration mining_attribute_clause.gif

Purpose

This function is for use with classification models created by the DBMS_DATA_MINING package or with the Oracle Data Mining Java API. It is not valid with other types of models. It returns the probability for a given prediction as an Oracle NUMBER.

If you specify the optional class parameter, then the function returns the probability for the specified class. This is equivalent to the probability associated with choosing the given target class value.

If you omit the class parameter, then the function returns the probability associated with the best prediction. You can use this form in conjunction with the PREDICTION function to obtain the best pair of prediction value and probability.

The mining_attribute_clause behaves as described for the PREDICTION function. Refer to mining_attribute_clause.

Example

The following example returns the 10 customers living in Italy who are most likely to use an affinity card.

This example, and the prerequisite data mining operations, including the creation of the view, can be found in the demo files $ORACLE_HOME/rdbms/demo/dmdtdemo.sql. General information on data mining demo files is available in Oracle Data Mining Administrator's Guide. The example is presented here to illustrate the syntactic use of the function.

SELECT cust_id FROM (
   SELECT cust_id
   FROM mining_data_apply_v
   WHERE country_name = 'Italy'
   ORDER BY PREDICTION_PROBABILITY(DT_SH_Clas_sample, 1 USING *)
      DESC, cust_id)
   WHERE rownum < 11;
 
   CUST_ID
----------
    100081
    100179
    100185
    100324
    100344
    100554
    100662
    100733
    101250
    101306
 
10 rows selected.