Returns a data frame detailing the available Census vectors (i.e. variables) for a given Census
dataset. This data frame has columns vector
containing the short code for the
variable, type
describing whether it's a female, male, or total aggregate, label
indicating the name of the variable, units
indicating whether the value represents a
numeric integer, percentage, dollar figure, or ratio, parent_vector
to show hierarchical
relationship, aggregation
indicating whether the value is additive or a transformation,
and a column details
with a detailed description of the variable generated by traversing
all labels within its hierarchical structure.