Frequencies for first 10,000 rows of vmonth variable in nhamcsed2014 dataset :

   Month of |
      Visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    January |        791        7.91        7.91
   February |        887        8.87       16.78
      March |      1,020       10.20       26.98
      April |        836        8.36       35.34
        May |        923        9.23       44.57
       June |        828        8.28       52.85
       July |        857        8.57       61.42
     August |      1,098       10.98       72.40
  September |        802        8.02       80.42
    October |        749        7.49       87.91
   November |        566        5.66       93.57
   December |        643        6.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017