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The chart at the top of the "regression series" sidebar is not appropriate to include in any topic in which the form of regression being discussed is NOT that of the chart.
It's EXTREMELY confusing to find an unrelated chart, in the wikipedia position that normally displays a RELATED one.
this may well be an issue with the field of statistics in general and not necessarily one specific to Wikipedia but here it goes.
I found circular confusion by navigating across hyperlinks on this article and related ones, which I think should be rectified. under "General linear regression" a definition is given, which I rather think should be the one of "multiple linear regression". indeed, if one follows the link to the in-depth article on linear regression, this is how "multiple linear regression" is defined, with the added remark that this term is distinct from multivariate linear regression following which one in fact lands on the general linear model article.
I would vote for changing that "General linear regression" paragraph title to "Multiple linear regression".