# File app/models/attendance.rb, line 51
  def self.totalized_for_conference(conf)
    totals = {}
    people = {}

    self.for_conference(conf).each do |att|
      people[att.person] ||= 0
      people[att.person] += 1
    end

    people.keys.each do |att|
      totals[people[att]] ||= []
      totals[people[att]] << att
    end

    totals
  end