Frequencies for first 10,000 rows of proc5r variable in namcs2010 dataset :

  procedure |
       #5 - |
    numeric |
     recode |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,991       99.91       99.91
       4528 |          1        0.01       99.92
       8630 |          1        0.01       99.93
       8938 |          1        0.01       99.94
       8959 |          1        0.01       99.95
       9390 |          1        0.01       99.96
       9396 |          1        0.01       99.97
       9419 |          1        0.01       99.98
       9789 |          1        0.01       99.99
       9941 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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