is an option for LinearModelFit and other fitting functions that specifies whether a constant term should be included if not explicitly given in the list of basis functions.


IncludeConstantBasis
is an option for LinearModelFit and other fitting functions that specifies whether a constant term should be included if not explicitly given in the list of basis functions.
Details

- The default setting IncludeConstantBasis->True adds a constant basis to the model if one is not specified in the list of basis functions.
- Linear and generalized linear models typically compare the fitted model to the mean response model, which contains only a constant basis function.
- Setting IncludeConstantBasis->False can be used to fit models without a constant basis function.
History
Text
Wolfram Research (2008), IncludeConstantBasis, Wolfram Language function, https://reference.wolfram.com/language/ref/IncludeConstantBasis.html.
CMS
Wolfram Language. 2008. "IncludeConstantBasis." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/IncludeConstantBasis.html.
APA
Wolfram Language. (2008). IncludeConstantBasis. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/IncludeConstantBasis.html
BibTeX
@misc{reference.wolfram_2025_includeconstantbasis, author="Wolfram Research", title="{IncludeConstantBasis}", year="2008", howpublished="\url{https://reference.wolfram.com/language/ref/IncludeConstantBasis.html}", note=[Accessed: 08-August-2025]}
BibLaTeX
@online{reference.wolfram_2025_includeconstantbasis, organization={Wolfram Research}, title={IncludeConstantBasis}, year={2008}, url={https://reference.wolfram.com/language/ref/IncludeConstantBasis.html}, note=[Accessed: 08-August-2025]}