Device for determining physical quantity e.g. position from erroneous measured values, has evidence determiner which determines overall evidence for measured values based on redundancy contained in subgroup

The device has a grouping unit (10) groups the measured values containing errors into multiple subgroups. A calculator (12) calculates a reliability quantity for each subgroup based on redundancy contained in subgroup. An individual allocator (14) allocates individual evidence quantity to measured values based on reliability quantity for respective subgroups. An evidence determiner (16) determines overall evidence for measured values based on individual evidence quantities. A processor (18) calculates physical quantity by using measured values and overall evidences. Independent claims are included for the following: (1) method for determining physical quantity from measured value containing error; and (2) computer program for determining physical quantity from measured value containing error.