The coeffa0, as defined by the United States Environmental Protection Agency via its SEDD Specification Version 5.2, is "the value of the zeroth order coefficient in a polynomial or regression equation. This term is sometimes referred to as the ‘b’ value or ‘y-intercept’ for a linear regression."
- 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.