Frequencies for first 10,000 rows of vmonth variable in nhamcsed2012 dataset :

   Month of |
      Visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    January |        631        6.31        6.31
   February |        523        5.23       11.54
      March |        794        7.94       19.48
      April |        806        8.06       27.54
        May |        787        7.87       35.41
       June |        711        7.11       42.52
       July |        811        8.11       50.63
     August |        917        9.17       59.80
  September |      1,305       13.05       72.85
    October |        914        9.14       81.99
   November |        794        7.94       89.93
   December |      1,007       10.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016