def describe methods=nil
          methods ||= %i[count mean std min max]
          description = methods.map { |m| send(m) }
          Daru::Vector.new(description, index: methods, name: :statistics)
        end
Create a summary of count, mean, standard deviation, min and max of
the vector in one shot.

== Arguments

+methods+ - An array with aggregation methods specified as symbols to
be applied to vectors. Default is [:count, :mean, :std, :max,
:min]. Methods will be applied in the specified order.