Nothing
index2formula <-
function(index,maximal.mod){
terms<-attributes(maximal.mod$x)$assign+1 ## terms in maximal model
indo.terms<-unique(terms[index==1]) ## terms in formula model
modA<-maximal.mod
term.labels<-attr(summary(modA)$terms,"term.labels")[indo.terms[-1]-1] ## term labels in formula model
form<-paste0("y~",term.labels[1]) ## cobble together the formula
if(length(term.labels)>1){
for(i in 2:length(term.labels)){
form<-paste0(form,"+",term.labels[i])}}
form<-as.formula(form)
form}
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