Frequencies for first 10,000 rows of othproc3 variable in namcs2007 dataset :

procedure 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,981       99.81       99.81
       863- |          3        0.03       99.84
       8913 |          2        0.02       99.86
       8939 |          8        0.08       99.94
       9509 |          1        0.01       99.95
       9929 |          1        0.01       99.96
       9941 |          1        0.01       99.97
       9948 |          1        0.01       99.98
       9999 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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