Frequencies for first 10,000 rows of proc63d variable in namcs2011 dataset :

Procedure 6 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,968       99.68       99.68
        494 |          1        0.01       99.69
        861 |          1        0.01       99.70
        891 |         16        0.16       99.86
        892 |          2        0.02       99.88
        893 |          4        0.04       99.92
        895 |          4        0.04       99.96
        920 |          2        0.02       99.98
        950 |          1        0.01       99.99
        954 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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