Frequencies for first 10,000 rows of surgday variable in nhamcsed2011 dataset :

   How many |
  days in a |
   week are |
  inpatient |
   elective |
  surgeries |
 scheduled? |      Freq.     Percent        Cum.
------------+-----------------------------------
    Unknown |        849        8.49        8.49
          0 |        134        1.34        9.83
          2 |        184        1.84       11.67
          3 |         96        0.96       12.63
          5 |      7,796       77.96       90.59
          6 |        574        5.74       96.33
          7 |        367        3.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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