Frequencies for first 10,000 rows of vdayr variable in nhamcsopd2009 dataset :

day of week |
   of visit |      Freq.     Percent        Cum.
------------+-----------------------------------
     sunday |         86        0.86        0.86
     monday |      1,990       19.90       20.76
    tuesday |      2,066       20.66       41.42
  wednesday |      2,147       21.47       62.89
   thursday |      1,943       19.43       82.32
     friday |      1,652       16.52       98.84
   saturday |        116        1.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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