def labelable_values (var)
    # For non-string variables, only values that look
    # like integers can be labeled.
    return var.values if var.is_string_var
    var.values.find_all { |val| val.value.to_s =~ /^\-?\d+$/ }
end
def labelable_values (var)
    # For non-string variables, only values that look
    # like integers can be labeled.
    return var.values if var.is_string_var
    var.values.find_all { |val| val.value.to_s =~ /^\-?\d+$/ }
end
Helper methods for values and their labels.