Generalized Additive Models with R gam

I have fitted for the first time a GAM with smoothing splines. Since I’m new to GAMs, what features of the output ‘summary(gam)’ I should look at, besides the sig. of the param. and nonparam. effects? Are there any useful diagnostics, as in standard Multiple Regression? Finally, how can I estimate the value of FM(‘x’) at which the slope of the nonlinear, quadratic fit changes direction (see attached figure)? Thanks!
20221122_172044

Check these resources:

2 Likes