Frequencies for first 10,000 rows of vmonth variable in namcs2010 dataset :

   month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    january |        908        9.08        9.08
   february |        920        9.20       18.28
      march |        738        7.38       25.66
      april |        744        7.44       33.10
        may |        766        7.66       40.76
       june |      1,055       10.55       51.31
       july |        923        9.23       60.54
     august |        725        7.25       67.79
  september |        708        7.08       74.87
    october |        987        9.87       84.74
   november |        728        7.28       92.02
   december |        798        7.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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