Transition probability calculation device, total value calculation device, transition probability calculation method, total value calculation method

摘要

PROBLEM TO BE SOLVED: To provide a technology for calculating transition probability for calculating a statistical value from a secret individual data group with respect to a database including continuous attribute values.SOLUTION: A transition probability calculation device includes: a fragmentation part; a tabulation value information part; a fragmentation probability calculation part; and an integration part, and the transition probability calculation device is configured to divide the value range of continuous attribute values into a finite number of sections, and to calculate transition probability by using the number of attribute values included in each section. A tabulation value calculation device includes: the transition probability calculation device; a section setting part; and a tabulation value updating part, and the tabulation value calculation device is configured to define the calculated transition probability as the element of a transition probability matrix, and to calculate a statistical value from a secret individual data group by using an inverse matrix method or a repetition Bayesian method.