Christopher Cesar chriscesar
gavinsimpson
/ Deriv.R
Last active
December 6, 2021 17:05
R functions to compute and plot the first derivative of a spline term in a GAM(M) fitted by `gam()` or `gamm()` in package mgcv
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| ################################################ | |
| ## Functions for derivatives of GAM(M) models ## | |
| ################################################ | |
| Deriv <- function(mod, n = 200, eps = 1e-7, newdata, term) { | |
| if(inherits(mod, "gamm")) | |
| mod <- mod$gam | |
| m.terms <- attr(terms(mod), "term.labels") | |
| if(missing(newdata)) { | |
| newD <- sapply(model.frame(mod)[, m.terms, drop = FALSE], | |
| function(x) seq(min(x), max(x), length = n)) |