ACTION PROBABILITY ESTIMATION DEVICE, METHOD AND PROGRAM

PROBLEM TO BE SOLVED: To accurately estimate an action probability of a user.SOLUTION: An action probability estimation device initializes a zindicating what a topic that an item v for which a user d takes a specific action in i-th order belongs to, calculates an item statistic N, an attribute statistic Land a topic statistic M, updates the value of z, repeats each processing to determine each value, calculates a indicating a probability that the user d belongs to each topic k, a indicating a probability that each item v of an attribute s is selected in a topic k and a ψindicating a probability that the attribute s is selected in the topic k, calculates a user item probability vindicating a probability that the user d takes the action for the item v, calculates a user attribute item probability vindicating a probability that the user d takes the action for the item v of the attribute s, and calculates a user attribute sindicating a probability that the user d takes the action for an item of the attribute s.