Utilities to Facilitate Modeling Routines with Generalized Additive Models R package gamutil version 0.8.1 After fitting a Generalized Additive (Mixed) Model, the next step is often to obtain predicted values for certain combinations of predictors for visualization of estimated effects in the model. It involves constructing a new data frame, add predicted values, and finally makes a (contour) plot. This package is intended to facilitate these steps to visualize estimated effects in a generalized additive model. The underlying modeling methodology is described in Wood (2017, ISBN:9781498728331). Software Depends: R (>= 3.5) Imports: ggplot2, lifecycle, metR, mgcv, RColorBrewer Suggests: testthat (>= 3.0.0), knitr, rmarkdown, RhpcBLASctl Motoki Saito <motokisaito.8623@gmail.com> Comprehensive R Archive Network (CRAN) Motoki Saito [aut, cre] (ORCID: <https://orcid.org/0000-0003-0785-5813>) MIT + file LICENSE (https://CRAN.R-project.org/package=gamutil/LICENSE) 2026-05-11 application/tgz https://CRAN.R-project.org/package=gamutil doi:10.32614/CRAN.package.gamutil en-US