Frequencies for first 10,000 rows of vmonth variable in namcs1995 dataset :

   month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    January |      1,559       15.59       15.59
   February |      1,243       12.43       28.02
      March |        992        9.92       37.94
      April |        629        6.29       44.23
        May |        617        6.17       50.40
       June |        670        6.70       57.10
       July |        651        6.51       63.61
     August |        771        7.71       71.32
  September |        739        7.39       78.71
    October |      1,008       10.08       88.79
   November |        646        6.46       95.25
   December |        475        4.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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