Frequencies for first 10,000 rows of surgday variable in nhamcsed2008 dataset :

   how many |
  days in a |
   week are |
   elective |
  surgeries |
 scheduled? |      Freq.     Percent        Cum.
------------+-----------------------------------
      blank |        221        2.21        2.21
    unknown |        778        7.78        9.99
          0 |        762        7.62       17.61
          3 |         90        0.90       18.51
          4 |        110        1.10       19.61
          5 |      6,603       66.03       85.64
          6 |      1,227       12.27       97.91
          7 |        209        2.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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