Frequencies for first 10,000 rows of surgday variable in nhamcsed2009 dataset :

   how many |
  days in a |
   week are |
   elective |
  surgeries |
 scheduled? |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |        246        2.46        2.46
         -8 |        965        9.65       12.11
          0 |         93        0.93       13.04
          1 |        104        1.04       14.08
          5 |      6,954       69.54       83.62
          6 |      1,172       11.72       95.34
          7 |        466        4.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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