rc: Specify Random Coefficients In A GAMLSS Formula
Description
Fits Random Coefficients In A GAMLSS Model.
Usage
rc(formula, lambda = NULL)
Arguments
formula
a model formula to specify the explanatory variable and the subject grouping factor e.g. formula=~x1|Subjects will fit
random constant and slopes for x1 for each level of Subjects
lambda
a matrix specifying the variance-covariance matrix for the random coefficients e.g. lambda=diag{2,5}
Value
The variables in the left side of the formula are returned with class "smooth", and attribute named "call" which is to be evaluated
in the backfitting additive.fit() called by gamlss()
Warning
This is experimental
Details
This is an experimental function and it is likely to change in the near future.
For a chosen fixed variance-covariance matrix for the random coefficients, this function finds the MAP estimates for the constant and slope random effects for the different subjects
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.
.