Frequencies for first 10,000 rows of proc5 variable in namcs2011 dataset :

Procedure 5 |
  - 4 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,948       99.48       99.48
       1739 |          1        0.01       99.49
       282- |          1        0.01       99.50
       4946 |          1        0.01       99.51
       6563 |          1        0.01       99.52
       8913 |          5        0.05       99.57
       8925 |          1        0.01       99.58
       8929 |         14        0.14       99.72
       8931 |          1        0.01       99.73
       8938 |          4        0.04       99.77
       8939 |          1        0.01       99.78
       8959 |         10        0.10       99.88
       9039 |          1        0.01       99.89
       9092 |          1        0.01       99.90
       9201 |          3        0.03       99.93
       9509 |          3        0.03       99.96
       9547 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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