An approach to combining results from multiple methods motivated by the ISO GUM

Abstract

The problem of determining a consensus value and its uncertainty from the results of multiple methods or laboratories is dis- cussed. Desirable criteria of a solution are presented. A solution motivated by the ISO Guide to the Expression of Uncer- tainty in Measurement (ISO GUM) is intro- duced and applied in a detailed worked example. A Bayesian hierarchical model motivated by the proposed solution is presented and compared to the solution.