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RangeMid (DMX)

  • Artikkeli

Applies to: SQL Server Analysis Services

Returns the midpoint of the predicted bucket that is discovered for a discretized column.

Syntax

  
RangeMid(<scalar column reference>)

Applies To

Discretized scalar columns.

Return Type

A scalar value.

Remarks

When used with SELECT FROM <model> PREDICTION JOIN (DMX), the RangeMin, RangeMid, and RangeMax functions return the actual boundary values of the specified bucket. For example, if you perform a prediction on a discretized column, the query returns the predicted bucket number in the discretized column. The RangeMin, RangeMid, and RangeMax functions describe the bucket that the prediction specifies. When the RangeMid function is used with a PREDICTION JOIN statement, the scalar column reference can only contain discrete, predictable columns.

Examples

The following example returns the minimum, maximum, and average values for the Yearly Income continuous column in a TM Decision Tree mining model.

SELECT DISTINCT   
    RangeMin([Yearly Income]) AS [Bucket Minimum],  
    RangeMid([Yearly Income]) AS [Bucket Average],   
    RangeMax([Yearly Income]) AS [Bucket Maximum]  
FROM [TM Decision Tree]

See Also

Data Mining Extensions (DMX) Function Reference
Functions (DMX)
General Prediction Functions (DMX)
RangeMax (DMX)
RangeMin (DMX)