Frequencies for first 10,000 rows of vmonth variable in namcs2002 dataset :

   Month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    January |         79        0.79        0.79
   February |        161        1.61        2.40
      March |        889        8.89       11.29
      April |      1,269       12.69       23.98
        May |      1,319       13.19       37.17
       June |      1,357       13.57       50.74
       July |      1,076       10.76       61.50
     August |        986        9.86       71.36
  September |        713        7.13       78.49
    October |        641        6.41       84.90
   November |        705        7.05       91.95
   December |        805        8.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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