summarize.by.factors
. A table is generated to display
the estimated average rate of missingness for every point in the space of
categorical covariates. Reference levels may be selected for each category
to reduce the size of the table
rates.by.category(x, reference.levels = c())
lllcrc
or vgam.crc
format.data
. For example,
if sex is a variable, two columns x.dis.1.M
and x.dis.1.F
may
be included in the table unless one of them is specified as a reference
level