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Fixing problems with model diagnostics

You can use gam.check() to improve models by updating them based on its results.

Cet exercice fait partie du cours

Nonlinear Modeling with Generalized Additive Models (GAMs) in R

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Instructions

  • 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 mod2 to ensure you have fixed the issue.

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

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
___
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