Frequencies for first 10,000 rows of therpr23 variable in namcs1998 dataset :

      other |
  ther/prev |
 service #2 |
    - 3 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,985       99.85       99.85
        535 |          1        0.01       99.86
        598 |          1        0.01       99.87
        893 |          3        0.03       99.90
        894 |          1        0.01       99.91
        935 |          4        0.04       99.95
        939 |          1        0.01       99.96
        941 |          2        0.02       99.98
        944 |          1        0.01       99.99
        965 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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