1. An apparatus for feature extraction, the apparatus comprising: a memory; and at least one processor device, coupled to the memory, operative to: a) receive at least one query to predict at least one future value of a given value series based on a statistical model; b) produce at least two predictions of the future value fulfilling at least the properties of 1) each being as probable as possible given the statistical model and 2) being mutually divert; and c) query a user to select one of the predictions.