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The coeffa1, as defined by the United States Environmental Protection Agency via its SEDD Specification Version 5.2, is "the value of the first order coefficient in a polynomial or regression equation. This term is sometimes referred to as the ‘slope’ for a linear regression."[1]


  1. U.S. Environmental Protection Agency (March 2019). "Appendix A. Data Element Dictionary (DED)" (PDF). SEDD Specification Version 5.2. Retrieved 22 September 2022.