model.frame.gamlss: Extract a model.frame, a model matrix or terms from a GAMLSS object for a given distributional parameter

Description

model.frame.gamlss, model.matrix.gamlss and terms.gamlss are the gamlss versions of the generic functions model.frame, model.matrix and terms respectively.

Usage

## S3 method for class 'gamlss':
model.frame(formula, what = c("mu", "sigma", "nu", "tau"), ...)
## S3 method for class 'gamlss':
terms(x, what = c("mu", "sigma", "nu", "tau"), ...)
## S3 method for class 'gamlss':
model.matrix(object, what = c("mu", "sigma", "nu", "tau"), ...)

Arguments

formula

a gamlss object

object

a gamlss object

what

for which parameter to extract the model.frame, terms or model.frame

...

for extra arguments

Value

a model.frame, a model.matrix or terms

References

Rigby, R. A. and Stasinopoulos D. M. (2005). Generalized additive models for location, scale and shape,(with discussion), Appl. Statist., 54, part 3, pp 507-554. Stasinopoulos D. M., Rigby R.A. and Akantziliotou C. (2006) Instructions on how to use the GAMLSS package in R. Accompanying documentation in the current GAMLSS help files, (see also http://www.gamlss.org/). Stasinopoulos D. M. Rigby R.A. (2007) Generalized additive models for location scale and shape (GAMLSS) in R. Journal of Statistical Software, Vol. 23, Issue 7, Dec 2007, http://www.jstatsoft.org/v23/i07.

Examples

Run this code

data(aids)
mod<-gamlss(y~poly(x,3)+qrt, family=PO, data=aids) # 
model.frame(mod)
model.matrix(mod)
terms(mod, "mu")
rm(mod)