PredictVariance(<scalar column reference>)

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