Frequencies for first 10,000 rows of vmonth variable in namcs1994 dataset :

   month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    January |        926        9.26        9.26
   February |        744        7.44       16.70
      March |        808        8.08       24.78
      April |        863        8.63       33.41
        May |        665        6.65       40.06
       June |        884        8.84       48.90
       July |        843        8.43       57.33
     August |        870        8.70       66.03
  September |        969        9.69       75.72
    October |        757        7.57       83.29
   November |        772        7.72       91.01
   December |        899        8.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016