specifies the information to plot. There are three options: (1)
"auc" (by default)
to plot the curve of AUCs in the backwards elimination process, (2)
"ranking" to plot
the importance measure in initial ranking of each variable, and (3)
plot the probability of selection of each variable. The
"psel" option is only
available if a cross validation is performed by
For option (1),
digits arguments can be specified for more details (see below).
For options (2) and (3), the number of variables to plot and their order preference can be
order arguments, respectively (see below).