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mgcv (version 1.4-1.1)

GAMs with GCV smoothness estimation and GAMMs by REML/PQL

Description

Routines for GAMs and other generalized ridge regression with multiple smoothing parameter selection by GCV or UBRE/AIC. Also GAMMs by REML or PQL. Includes a gam() function.

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Version

Install

install.packages('mgcv')

Monthly Downloads

106,646

Version

1.4-1.1

License

GPL (>=2)

Maintainer

Simon Wood

Last Published

November 7th, 2025

Functions in mgcv (1.4-1.1)

gam.models

Specifying generalized additive models
full.score

GCV/UBRE score for use within nlm
gam.fit

GAM P-IRLS estimation with GCV/UBRE smoothness estimation
gam.outer

Minimize GCV or UBRE score of a GAM using `outer' iteration
new.name

Obtain a name for a new variable that is not already in use
smooth.construct.ad.smooth.spec

Adaptive smooths in GAMs
gam.control

Setting GAM fitting defaults
mgcv.control

Setting mgcv defaults
initial.sp

Starting values for multiple smoothing parameter estimation
fixDependence

Detect linear dependencies of one matrix on another
gamSim

Simulate example data for GAMs
smooth.construct.ps.smooth.spec

P-splines in GAMs
gam.selection

Generalized Additive Model Selection
cSplineDes

Evaluate cyclic B spline basis
magic.post.proc

Auxilliary information from magic fit
notExp

Functions for better-than-log positive parameterization
residuals.gam

Generalized Additive Model residuals
logLik.gam

Extract the log likelihood for a fitted GAM
exclude.too.far

Exclude prediction grid points too far from data
pdTens

Functions implementing a pdMat class for tensor product smooths
null.space.dimension

The basis of the space of un-penalized functions for a TPRS
place.knots

Automatically place a set of knots evenly through covariate values
negbin

GAM negative binomial family
magic

Stable Multiple Smoothing Parameter Estimation by GCV or UBRE, with optional fixed penalty
gam2objective

Objective functions for GAM smoothing parameter estimation
linear.functional.terms

Linear functionals of a smooth in GAMs
plot.gam

Default GAM plotting
notExp2

Alternative to log parameterization for variance components
predict.gam

Prediction from fitted GAM model
extract.lme.cov

Extract the data covariance matrix from an lme object
vcov.gam

Extract parameter (estimator) covariance matrix from GAM fit
gamObject

Fitted gam object
smooth.construct.cr.smooth.spec

Penalized Cubic regression splines in GAMs
gamm.setup

Generalized additive mixed model set up
smooth.construct

Constructor functions for smooth terms in a GAM
gam.convergence

GAM convergence and performance issues
pdIdnot

Overflow proof pdMat class for multiples of the identity matrix
smooth.terms

Smooth terms in GAM
summary.gam

Summary for a GAM fit
gam.check

Some diagnostics for a fitted gam model
interpret.gam

Interpret a GAM formula
get.var

Get named variable or evaluate expression from list or data.frame
print.gam

Generalized Additive Model default print statement
gam.setup

Generalized additive model set up
tensor.prod.model.matrix

Utility functions for constructing tensor product smooths
gam.method

Setting GAM fitting method
anova.gam

Hypothesis tests related to GAM fits
s

Defining smooths in GAM formulae
gam.side

Identifiability side conditions for a GAM
step.gam

Alternatives to step.gam
formXtViX

Form component of GAMM covariance matrix
smoothCon

Prediction/Construction wrapper functions for GAM smooth terms
influence.gam

Extract the diagonal of the influence/hat matrix for a GAM
gam

Generalized additive models with integrated smoothness estimation
mgcv

Multiple Smoothing Parameter Estimation by GCV or UBRE
model.matrix.gam

Extract model matrix from GAM fit
choose.k

Basis dimension choice for smooths
smooth.construct.tp.smooth.spec

Penalized thin plate regression splines in GAMs
te

Define tensor product smooths in GAM formulae
vis.gam

Visualization of GAM objects
mono.con

Monotonicity constraints for a cubic regression spline
Predict.matrix

Prediction methods for smooth terms in a GAM
formula.gam

GAM formula
gam.fit3

P-IRLS GAM estimation with GCV & UBRE/AIC derivative calculation
gamm

Generalized Additive Mixed Models
mgcv-package

GAMs with GCV smoothness estimation and GAMMs by REML/PQL
mroot

Smallest square root of matrix
pcls

Penalized Constrained Least Squares Fitting
fix.family.link

Modify families for use in GAM fitting
uniquecombs

find the unique rows in a matrix