Frequencies for first 10,000 rows of vmonth variable in nhamcsed1995 dataset :

   month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    January |        899        8.99        8.99
   February |        862        8.62       17.61
      March |        790        7.90       25.51
      April |        725        7.25       32.76
        May |        903        9.03       41.79
       June |        886        8.86       50.65
       July |        954        9.54       60.19
     August |        909        9.09       69.28
  September |        841        8.41       77.69
    October |        729        7.29       84.98
   November |        818        8.18       93.16
   December |        684        6.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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