Frequencies for first 10,000 rows of vmonth variable in namcs2007 dataset :

   month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    january |        747        7.47        7.47
   february |        664        6.64       14.11
      march |        827        8.27       22.38
      april |      1,100       11.00       33.38
        may |        952        9.52       42.90
       june |        822        8.22       51.12
       july |      1,074       10.74       61.86
     august |        912        9.12       70.98
  september |        784        7.84       78.82
    october |        783        7.83       86.65
   november |        606        6.06       92.71
   december |        729        7.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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