Frequencies for first 10,000 rows of vmonth variable in namcs2000 dataset :

   month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    January |        817        8.17        8.17
   February |      1,057       10.57       18.74
      March |        931        9.31       28.05
      April |        859        8.59       36.64
        May |        863        8.63       45.27
       June |        825        8.25       53.52
       July |        648        6.48       60.00
     August |        807        8.07       68.07
  September |        900        9.00       77.07
    October |        639        6.39       83.46
   November |        800        8.00       91.46
   December |        854        8.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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