Fixing problems with model diagnostics
You can use gam.check() to improve models by updating them based on its results.
Latihan ini adalah bagian dari kursus
Nonlinear Modeling with Generalized Additive Models (GAMs) in R
Petunjuk latihan
- Run the model diagnostics on
mod. - Based on the diagnostics, re-fit the model as
mod2, changing the number of basis functions (k) for failing smooths. - Run the model diagnostics on
mod2to ensure you have fixed the issue.
Latihan interaktif praktis
Cobalah latihan ini dengan menyelesaikan kode contoh berikut.
library(mgcv)
# Fit the model
mod <- gam(y ~ s(x0, k = 3) + s(x1, k = 3) + s(x2, k = 3) + s(x3, k = 3),
data = dat, method = "REML")
# Check the diagnostics
___
# Refit to fix issues
mod2 <- gam(y ~ s(x0, k = ___) + s(x1, k = ___) + s(x2, k = ___) + s(x3, k = ___),
data = dat, method = "REML")
# Check the new model
___