gamlss (version 4.2-4)

formula.gamlss: Extract the Model Formula in a GAMLSS fitted model

Description

formula.gamlss is the GAMLSS specific method for the generic function formula which extracts the model formula from objects returned by modelling functions.

Usage

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

Arguments

x

a GAMLSS fitted model

what

which parameter coefficient is required, default what="mu"

...

for extra arguments

Value

• Returns a model formula

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.

See Also

gamlss, deviance.gamlss, fitted.gamlss

Examples

data(aids)
h<-gamlss(y~poly(x,3)+qrt, family=PO, data=aids) # 
formula(h,"mu")
rm(h)