# File lib/churn/calculator.rb, line 127
    def self.to_s(hash)
      result = separator
      result +="* Revision Changes \n"
      result += separator
      result += display_array("Files", hash[:changed_files], :fields=>[:to_str], :headers=>{:to_str=>'file'})
      result += "\n"
      result += display_array("Classes", hash[:changed_classes])
      result += "\n"
      result += display_array("Methods", hash[:changed_methods]) + "\n"
      result += separator
      result +="* Project Churn \n"
      result += separator
      result += "\n"
      result += display_array("Files", hash[:changes])
      result += "\n"
      class_churn = collect_items(hash[:class_churn], 'klass')
      result += display_array("Classes", class_churn)
      result += "\n"
      method_churn = collect_items(hash[:method_churn], 'method')
      result += display_array("Methods", method_churn)
    end