Frequencies for first 10,000 rows of digsc23d variable in namcs2005 dataset :

 diagnostic |
 service #2 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,758       97.58       97.58
        891 |         15        0.15       97.73
        893 |        117        1.17       98.90
        894 |          3        0.03       98.93
        895 |          2        0.02       98.95
        897 |         15        0.15       99.10
        903 |         14        0.14       99.24
        904 |          1        0.01       99.25
        909 |          7        0.07       99.32
        916 |          3        0.03       99.35
        919 |          1        0.01       99.36
        930 |          3        0.03       99.39
        940 |          1        0.01       99.40
        941 |          1        0.01       99.41
        950 |         23        0.23       99.64
        954 |         18        0.18       99.82
        990 |          1        0.01       99.83
        992 |          1        0.01       99.84
        993 |          5        0.05       99.89
        994 |          1        0.01       99.90
        995 |          8        0.08       99.98
        999 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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