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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