formula.gamlss {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"), 
                parameter= NULL, ... )

Arguments

x

a GAMLSS fitted model

what

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

parameter

equivalent to what

...

for extra arguments

Value

Returns a model formula

Author(s)

Mikis Stasinopoulos

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.

Rigby, R. A., Stasinopoulos, D. M., Heller, G. Z., and De Bastiani, F. (2019) Distributions for modeling location, scale, and shape: Using GAMLSS in R, Chapman and Hall/CRC. An older version can be found in https://www.gamlss.com/.

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, https://www.jstatsoft.org/v23/i07/.

Stasinopoulos D. M., Rigby R.A., Heller G., Voudouris V., and De Bastiani F., (2017) Flexible Regression and Smoothing: Using GAMLSS in R, Chapman and Hall/CRC.

(see also https://www.gamlss.com/).

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)