Difference error ratio

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The difference error ratio, as defined by the United States Environmental Protection Agency via its SEDD Specification Version 5.2, is "the estimated error between two results defined as the absolute value of the difference of two values as a fraction of the square root of sum of squares of their result uncertainties."[1]


  1. U.S. Environmental Protection Agency (March 2019). "Appendix A. Data Element Dictionary (DED)" (PDF). SEDD Specification Version 5.2. https://www.epa.gov/sites/default/files/2019-05/documents/sedd_spec_v5-2-march_2019_508.pdf. Retrieved 22 September 2022.