daily    = []
      weekly   = []
      annually = []

      times = checkins.map { |i| i.created }
      times.each do |time|
        daily    << (0..23).to_a.map   { |i| if(time.hour == i) then 1 else 0 end }
        weekly   << (0..6).to_a.map    { |i| if(time.wday == i) then 1 else 0 end }
        annually << (0..365).to_a.map  { |i| if(time.yday == i) then 1 else 0 end }
      end