code: def weighted(type, group)
        if @weights[type].has_key?(group)
          selector = WeightedSelect::Selector.new @weights[type][group]
          selector.select
        end
      end
docs: Generate weighted-random value
  
   Type is :count, :first, :next or :last
   Group is symbol (for member count or first letter) or string representing letter
  
   @param [Symbol] type
   @param [Symbol|String] group