Frequencies for first 10,000 rows of vmonth variable in namcs1996 dataset :

   month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    January |        843        8.43        8.43
   February |      1,030       10.30       18.73
      March |        915        9.15       27.88
      April |      1,044       10.44       38.32
        May |      1,029       10.29       48.61
       June |        627        6.27       54.88
       July |        725        7.25       62.13
     August |        674        6.74       68.87
  September |        771        7.71       76.58
    October |        880        8.80       85.38
   November |        802        8.02       93.40
   December |        660        6.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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