Frequencies for first 10,000 rows of vmonth variable in nhamcsed2003 dataset :

   month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    january |        698        6.98        6.98
   february |        738        7.38       14.36
      march |        975        9.75       24.11
      april |        760        7.60       31.71
        may |        650        6.50       38.21
       june |        788        7.88       46.09
       july |        883        8.83       54.92
     august |      1,424       14.24       69.16
  september |        962        9.62       78.78
    october |        473        4.73       83.51
   november |        752        7.52       91.03
   december |        897        8.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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