Frequencies for first 10,000 rows of vmonth variable in nhamcsed2010 dataset :

   Month of |
      Visit |      Freq.     Percent        Cum.
------------+-----------------------------------
    january |      1,161       11.61       11.61
   february |      1,059       10.59       22.20
      march |        944        9.44       31.64
      april |      1,020       10.20       41.84
        may |        998        9.98       51.82
       june |        734        7.34       59.16
       july |        794        7.94       67.10
     august |        607        6.07       73.17
  september |        819        8.19       81.36
    october |        602        6.02       87.38
   november |        581        5.81       93.19
   december |        681        6.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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