Frequencies for first 10,000 rows of vmonth variable in namcs2008 dataset :

   month of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    january |        885        8.85        8.85
   february |        923        9.23       18.08
      march |        815        8.15       26.23
      april |        920        9.20       35.43
        may |        979        9.79       45.22
       june |        908        9.08       54.30
       july |        918        9.18       63.48
     august |        998        9.98       73.46
  september |        630        6.30       79.76
    october |        885        8.85       88.61
   november |        629        6.29       94.90
   december |        510        5.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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