Frequencies for first 10,000 rows of vdayr variable in nhamcsed2012 dataset :

Day of Week |
   of Visit |      Freq.     Percent        Cum.
------------+-----------------------------------
     Sunday |      1,410       14.10       14.10
     Monday |      1,575       15.75       29.85
    Tuesday |      1,469       14.69       44.54
  Wednesday |      1,413       14.13       58.67
   Thursday |      1,424       14.24       72.91
     Friday |      1,372       13.72       86.63
   Saturday |      1,337       13.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016