Nothing

```
#' @export
structree.default <-
function(formula,
data,
family=gaussian,
stop_criterion=c("AIC","BIC","CV","pvalue"),
splits_max=NULL,
fold=5,
alpha=0.05,
grid_value=NULL,
min_border=NULL,
ridge=FALSE,
constant_covs=FALSE,
trace=TRUE,
plot=TRUE,
k=10,
weights=NULL,
offset=NULL,
...){
# check input
if(missing(formula)){
stop("Argument formula is missing with no default.")
}
if(missing(data)){
stop("Argument data is missing with no default.")
}
# check family
if (is.character(family))
family <- get(family, mode = "function", envir = parent.frame())
if (is.function(family))
family <- family()
if (is.null(family$family)) {
print(family)
stop("'family' not recognized")
}
if (family$family=="Gamma") family <- Gamma(link="log")
stop_criterion <- match.arg(stop_criterion)
# predefinition
comp <- specification(formula,data)
y <- comp$y
DM_kov <- comp$DM_kov
if(comp$fixef){
secondlevel <- comp$secondlevel
slope <- comp$slope
} else{
which_kat <- comp$which_kat
which_smooth <- comp$which_smooth
}
if(comp$fixef){
if(stop_criterion == "CV"){
stop("Cross-Validation not implemented for repeated measurements!")
}
if((family$family=="Gamma" & !is.null(ridge))){
stop("Ridge estimation is only implemented for families: gaussian, binomial and poisson!")
}
lambda <- NULL
if(nrow(DM_kov)<1000){
n_levels <- nlevels(DM_kov[,secondlevel])
lambda <- setl(n_levels,family)
}
output <- structree_fixef(y,DM_kov,secondlevel,slope,family,stop_criterion,splits_max,
alpha,grid_value,min_border,ridge,constant_covs,trace,weights,offset,lambda)
attr(output,"type") <- "fixedEff"
attr(output,"secondlevel") <- secondlevel
attr(output,"slope") <- slope
} else{
output <- structree_cat(y,DM_kov,which_kat,which_smooth,family,stop_criterion,splits_max,fold,alpha,trace,plot,k,weights,offset)
attr(output,"type") <- "catPred"
attr(output,"which_kat") <- which_kat
attr(output,"which_smooth") <- which_smooth
if(!is.null(which_smooth)){
attr(output,"k") <- k
}
}
output$call <- match.call()
# define class
class(output) <- "structree"
return(output)
}
```

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