Frequencies for first 10,000 rows of othproc4 variable in namcs2007 dataset :

procedure 4 |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,998       99.98       99.98
       863- |          1        0.01       99.99
       8939 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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