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Doesn't nls() expect that the lengths of vectors on both sides of the formula match (if both are supplied)? Perhaps it should check for that. -Bill On Thu, Jan 26, 2023 at 12:17 AM Dave Armstrong <darmst46 at uwo.ca> wrote: > Dear Colleagues, > > I recently answered [this question]() on StackOverflow that identified > what seems to be unusual behaviour with `stats:::nls.fitted()`. In > particular, a null model returns a single fitted value rather than a > vector of the same fitt...

Dear Colleagues, I recently answered [this question]() on StackOverflow that identified what seems to be unusual behaviour with `stats:::nls.fitted()`. In particular, a null model returns a single fitted value rather than a vector of the same fitted value of `length(y)`. The documentation doesn?t make it seem like this is the intended behaviour, so I?m not sure if it?s a bug, a ?Wishlist?