1. A device for determining a physical quantity from a number of measured values comprising errors, wherein the physical quantity is defined by a measured quantity or a plurality of measured quantities, and wherein the number of the measured values is higher than the number of the measured quantities, comprising: a grouper for grouping the number of measured values comprising errors into a plurality of subgroups of measured values, wherein each subgroup comprises a redundancy, so that each subgroup includes a number of measured values, the number of measured values being greater than a number of measured quantities; a calculator for calculating a reliability quantity for each subgroup based on the redundancy comprised in the subgroup; an individual allocator for allocating individual evidence quantities to the measured values comprising errors of each subgroup based on the reliability quantity for the respective subgroups, so that a respective measured value has a plurality of individual evidence quantities allocated thereto; an evidence determiner for determining one overall evidence each for the measured values comprising errors based on the plurality of individual evidence quantities for the respective measured value; and a processor for calculating the physical quantity using at least some of the measured values comprising errors and at least some of the overall evidences.