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

  Number of |
  days in a |
       week |
   elective |
  surgeries |
  scheduled |      Freq.     Percent        Cum.
------------+-----------------------------------
    Unknown |        397        3.97        3.97
          0 |        244        2.44        6.41
          1 |        270        2.70        9.11
          2 |         79        0.79        9.90
          3 |         41        0.41       10.31
          4 |         16        0.16       10.47
          5 |      6,787       67.87       78.34
          6 |      1,726       17.26       95.60
          7 |        440        4.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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