Frequencies for first 10,000 rows of othproc3 variable in namcs2008 dataset :

procedure 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,993       99.93       99.93
       0391 |          1        0.01       99.94
       8938 |          2        0.02       99.96
       9375 |          1        0.01       99.97
       9939 |          1        0.01       99.98
       9941 |          1        0.01       99.99
       9947 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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