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