Frequencies for first 10,000 rows of surgday variable in nhamcsed2007 dataset :

   how many |
  days in a |
   week are |
   elective |
  surgeries |
 scheduled? |      Freq.     Percent        Cum.
------------+-----------------------------------
      blank |        372        3.72        3.72
    unknown |        840        8.40       12.12
          0 |        408        4.08       16.20
          2 |        112        1.12       17.32
          5 |      6,076       60.76       78.08
          6 |      1,852       18.52       96.60
          7 |        340        3.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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