Frequencies for first 10,000 rows of vmonth variable in namcs2005 dataset :

   month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    January |        780        7.80        7.80
   February |        882        8.82       16.62
      March |        928        9.28       25.90
      April |        955        9.55       35.45
        May |        713        7.13       42.58
       June |        850        8.50       51.08
       July |        830        8.30       59.38
     August |        843        8.43       67.81
  September |        777        7.77       75.58
    October |        670        6.70       82.28
   November |        960        9.60       91.88
   December |        812        8.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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