Frequencies for first 10,000 rows of proc5r variable in namcs2009 dataset :

  procedure |
       #5 - |
    numeric |
     recode |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,995       99.95       99.95
       8913 |          2        0.02       99.97
       8938 |          1        0.01       99.98
       9509 |          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