Frequencies for first 10,000 rows of proc43d variable in namcs2009 dataset :

procedure 4 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,920       99.20       99.20
        044 |          3        0.03       99.23
        048 |          1        0.01       99.24
        817 |          1        0.01       99.25
        819 |          1        0.01       99.26
        891 |          8        0.08       99.34
        893 |         18        0.18       99.52
        895 |         32        0.32       99.84
        903 |          1        0.01       99.85
        930 |          1        0.01       99.86
        935 |          1        0.01       99.87
        936 |          1        0.01       99.88
        941 |          1        0.01       99.89
        950 |          3        0.03       99.92
        965 |          1        0.01       99.93
        992 |          1        0.01       99.94
        994 |          4        0.04       99.98
        995 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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