Frequencies for first 10,000 rows of vdayr variable in nhamcsopd2008 dataset :

day of week |
   of visit |      Freq.     Percent        Cum.
------------+-----------------------------------
     sunday |        150        1.50        1.50
     monday |      1,999       19.99       21.49
    tuesday |      2,152       21.52       43.01
  wednesday |      1,963       19.63       62.64
   thursday |      1,949       19.49       82.13
     friday |      1,596       15.96       98.09
   saturday |        191        1.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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