[R] REmove level with zero observations

[GL]

Ended up working as follows:

dbs3.train.sans.influential.obs <-
drop.levels(dbs3.train.sans.influential.obs)

drop.list <- NULL
for (i in 4:ncol(dbs3.train.sans.influential.obs)) {       
     if (nlevels(dbs3.train.sans.influential.obs[,i]) < 2) {drop.list <-
cbind(drop.list,i)}}

dbs3.train.sans.influential.obs <-
dbs3.train.sans.influential.obs[-c(drop.list)]
-- 
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