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Questions - poly

Issues predicting with `nlme::gls`quadratic model fitted with `poly(..., 2)`

I have fitted a quadratic model with a variance structure that allows different variance levels per level of a factor, and I’m having trouble predicting on a new data set with 2 entries only. Here’s a...
test-img

Ceres

r

nlme

poly

Votes: 0

Answers: 1

Latest Answer

Thanks to @BenBolker and @russ-lenth for confirming that the issue is related to the missing terms attribute "predvars" in the GLS object, which provides the fitted coefficients for poly. No...
test-img

Ceres

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