Frequencies for first 10,000 rows of vmonth variable in nhamcsed1994 dataset :

   month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    January |        886        8.86        8.86
   February |        756        7.56       16.42
      March |        835        8.35       24.77
      April |      1,103       11.03       35.80
        May |      1,036       10.36       46.16
       June |        899        8.99       55.15
       July |        882        8.82       63.97
     August |        884        8.84       72.81
  September |        682        6.82       79.63
    October |        716        7.16       86.79
   November |        638        6.38       93.17
   December |        683        6.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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