Frequencies for first 10,000 rows of vmonth variable in namcs1993 dataset :

   month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    January |        842        8.42        8.42
   February |        917        9.17       17.59
      March |        977        9.77       27.36
      April |      1,035       10.35       37.71
        May |        770        7.70       45.41
       June |        612        6.12       51.53
       July |        523        5.23       56.76
     August |      1,082       10.82       67.58
  September |        847        8.47       76.05
    October |        704        7.04       83.09
   November |        869        8.69       91.78
   December |        822        8.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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