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PredictVariance (DMX)

Returns the variance of a specified column.

PredictVariance(<scalar column reference>)

A scalar column.

A scalar value of the type that is specified by <scalar column reference>.

If the column reference is discrete, PredictVariance returns 0 because the variance cannot be calculated from discrete values.

The following example uses a natural prediction join to determine if an individual is likely to be a bike buyer based on the TM Decision Tree mining model, and also determines the variance for the prediction.

SELECT
  [Bike Buyer],
  PredictVariance([Bike Buyer]) AS [Variance]
FROM
  [TM Decision Tree]
NATURAL PREDICTION JOIN
(SELECT 28 AS [Age],
  '2-5 Miles' AS [Commute Distance],
  'Graduate Degree' AS [Education],
  0 AS [Number Cars Owned],
  0 AS [Number Children At Home]) AS t
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