Calculates the Cook`s distance for Generalized Additive Mixed Models (GAMM)

Source: R/cooks_dist_gamm.R

cooks_dist_gamm is a helper function for model_gamm and plot_diagnostics and calculates the Cook`s distance for objects of class `gamm`. The Cook`s distance D is a leave-one-out deletion diagnostics to measure the influence of each observation. The generic cooks.distance function does not work on the class `gamm`.

cooks_dist_gamm(gamm_model)

Arguments

gamm_model

The ‘gam‘ sublist from a model object of class gamm.

Value

The function returns a numerical vector of the same length then the data used for the GAMM fitting, with one D value for each IND observation.

See also

plot_diagnostics, model_gamm

Examples

# Using a model of the Baltic Sea demo data
cooks_dist_gamm(gamm_model = model_gamm_ex$model[[49]]$gam)

#>  [1] 0.0460675187 0.1080646017 0.0503192828 0.1067891853 0.0575550841
#>  [6] 0.0255400410 0.0234023740 0.0048989219 0.0002499257 0.0381821247
#> [11] 0.0099427739 0.2407901638 0.2051295214 0.0810731214 0.0156367638
#> [16] 0.0533046271 0.0083600003 0.0008566615 0.0029952101 0.0024327747
#> [21] 0.0121084485 0.0017002941 0.0011592551 0.0174526702 0.0191117427
#> [26] 0.0074871620 0.0036439743