S4 classes to hold information extracted from labels. End users would not normally interact directly with these classes.
labels
Character vector holding labels.
int_min
Integer scalar. Lowest value for integer labels.
int_max
Integer scalar. Highest value for integer labels.
breaks
Integers or dates. Boundaries between intervals.
break_min
Integer scalar or date. Lower boundary for intervals.
break_max
Integer scalar or date. Upper boundary for intervals.
open_first
Logical flag. Whether there is an interval open on the left.
open_last
Logical flag. Whether there is an interval open on the right.
include_na
Logical. Whether labels include an
NA
.
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