It can be useful in exploratory graphics to impute data outside the range of
the data. impute_below
imputes all variables with missings to have
values 10
values adds a new string or label. It is powered by shadow_shift
, so
please see the documentation for shadow_shift()
to full details on the
different implementations.
impute_below(...)
extra arguments to pass - see shadow_shift()
for discussion on this.