Frequencies for first 10,000 rows of vdayr variable in nhamcsopd2003 dataset :

day of week |
   of visit |      Freq.     Percent        Cum.
------------+-----------------------------------
     sunday |        142        1.42        1.42
     monday |      2,064       20.64       22.06
    tuesday |      2,121       21.21       43.27
  wednesday |      1,971       19.71       62.98
   thursday |      1,915       19.15       82.13
     friday |      1,613       16.13       98.26
   saturday |        174        1.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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