Frequencies for first 10,000 rows of vmonth variable in namcs2013 dataset :

   Month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    January |        829        8.29        8.29
   February |        668        6.68       14.97
      March |        829        8.29       23.26
      April |        989        9.89       33.15
        May |        987        9.87       43.02
       June |        794        7.94       50.96
       July |        801        8.01       58.97
     August |        909        9.09       68.06
  September |        753        7.53       75.59
    October |        943        9.43       85.02
   November |        836        8.36       93.38
   December |        662        6.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017