6.5 Dynamic Scoring
The Data Mining SQL functions operate in two modes: by applying a pre-defined model, or by executing an analytic clause. If you supply an analytic clause instead of a model name, the function builds one or more transient models and uses them to score the data.
The ability to score data dynamically without a pre-defined model extends the application of basic embedded data mining techniques into environments where models are not available. Dynamic scoring, however, has limitations. The transient models created during dynamic scoring are not available for inspection or fine tuning. Applications that require model inspection, the correlation of scoring results with the model, special algorithm settings, or multiple scoring queries that use the same model, require a predefined model.
The following example shows a dynamic scoring query. The example identifies the rows in the input data that contain unusual customer age values.
Example 6-13 Dynamic Prediction
SELECT cust_id, age, pred_age, age-pred_age age_diff, pred_det FROM
(SELECT cust_id, age, pred_age, pred_det,
RANK() OVER (ORDER BY ABS(age-pred_age) DESC) rnk FROM
(SELECT cust_id, age,
PREDICTION(FOR age USING *) OVER () pred_age,
PREDICTION_DETAILS(FOR age ABS USING *) OVER () pred_det
FROM mining_data_apply_v))
WHERE rnk <= 5;
CUST_ID AGE PRED_AGE AGE_DIFF PRED_DET
------- ---- ---------- -------- --------------------------------------------------------------
100910 80 40.6686505 39.33 <Details algorithm="Support Vector Machines">
<Attribute name="HOME_THEATER_PACKAGE" actualValue="1"
weight=".059" rank="1"/>
<Attribute name="Y_BOX_GAMES" actualValue="0"
weight=".059" rank="2"/>
<Attribute name="AFFINITY_CARD" actualValue="0"
weight=".059" rank="3"/>
<Attribute name="FLAT_PANEL_MONITOR" actualValue="1"
weight=".059" rank="4"/>
<Attribute name="YRS_RESIDENCE" actualValue="4"
weight=".059" rank="5"/>
</Details>
101285 79 42.1753571 36.82 <Details algorithm="Support Vector Machines">
<Attribute name="HOME_THEATER_PACKAGE" actualValue="1"
weight=".059" rank="1"/>
<Attribute name="HOUSEHOLD_SIZE" actualValue="2" weight=".059"
rank="2"/>
<Attribute name="CUST_MARITAL_STATUS" actualValue="Mabsent"
weight=".059" rank="3"/>
<Attribute name="Y_BOX_GAMES" actualValue="0" weight=".059"
rank="4"/>
<Attribute name="OCCUPATION" actualValue="Prof." weight=".059"
rank="5"/>
</Details>
100694 77 41.0396722 35.96 <Details algorithm="Support Vector Machines">
<Attribute name="HOME_THEATER_PACKAGE" actualValue="1"
weight=".059" rank="1"/>
<Attribute name="EDUCATION" actualValue="< Bach."
weight=".059" rank="2"/>
<Attribute name="Y_BOX_GAMES" actualValue="0" weight=".059"
rank="3"/>
<Attribute name="CUST_ID" actualValue="100694" weight=".059"
rank="4"/>
<Attribute name="COUNTRY_NAME" actualValue="United States of
America" weight=".059" rank="5"/>
</Details>
100308 81 45.3252491 35.67 <Details algorithm="Support Vector Machines">
<Attribute name="HOME_THEATER_PACKAGE" actualValue="1"
weight=".059" rank="1"/>
<Attribute name="Y_BOX_GAMES" actualValue="0" weight=".059"
rank="2"/>
<Attribute name="HOUSEHOLD_SIZE" actualValue="2" weight=".059"
rank="3"/>
<Attribute name="FLAT_PANEL_MONITOR" actualValue="1"
weight=".059" rank="4"/>
<Attribute name="CUST_GENDER" actualValue="F" weight=".059"
rank="5"/>
</Details>
101256 90 54.3862214 35.61 <Details algorithm="Support Vector Machines">
<Attribute name="YRS_RESIDENCE" actualValue="9" weight=".059"
rank="1"/>
<Attribute name="HOME_THEATER_PACKAGE" actualValue="1"
weight=".059" rank="2"/>
<Attribute name="EDUCATION" actualValue="< Bach."
weight=".059" rank="3"/>
<Attribute name="Y_BOX_GAMES" actualValue="0" weight=".059"
rank="4"/>
<Attribute name="COUNTRY_NAME" actualValue="United States of
America" weight=".059" rank="5"/>
</Details>