Frequencies for first 10,000 rows of othproc4 variable in nhamcsopd2006 dataset :

procedure 4 |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,995       99.95       99.95
       586- |          1        0.01       99.96
       9999 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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