The fitted function for age seems to be well approximated by a
quadratic term. The graphs below show the non-parametric additive fit, and also
the parametric approximation using a polynomial of degree 2.
Non-parametric additive
fit
Parametric approximation
There is hardly any difference in the two graphs indicating a very good
parametric approximation.
Generalized Additive Models 23.4.96 Page : 12b of 15
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