Frequencies for first 10,000 rows of digsc23d variable in namcs2007 dataset :

 diagnostic |
 service #2 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,634       96.34       96.34
        753 |          3        0.03       96.37
        863 |          1        0.01       96.38
        874 |          1        0.01       96.39
        876 |          1        0.01       96.40
        887 |          3        0.03       96.43
        890 |          1        0.01       96.44
        891 |         11        0.11       96.55
        893 |         61        0.61       97.16
        895 |         11        0.11       97.27
        897 |          1        0.01       97.28
        903 |         13        0.13       97.41
        904 |          1        0.01       97.42
        905 |          2        0.02       97.44
        909 |          2        0.02       97.46
        913 |          4        0.04       97.50
        914 |          5        0.05       97.55
        919 |          2        0.02       97.57
        930 |          2        0.02       97.59
        950 |        221        2.21       99.80
        954 |         10        0.10       99.90
        992 |          1        0.01       99.91
        995 |          1        0.01       99.92
        999 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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