Frequencies for first 10,000 rows of therpr22 variable in namcs1999 dataset :

      other |
  ther/prev |
 service #2 |
    - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,985       99.85       99.85
         37 |          1        0.01       99.86
         38 |          1        0.01       99.87
         44 |          1        0.01       99.88
         45 |          1        0.01       99.89
         57 |          1        0.01       99.90
         86 |          1        0.01       99.91
         89 |          2        0.02       99.93
         93 |          1        0.01       99.94
         94 |          2        0.02       99.96
         95 |          1        0.01       99.97
         96 |          2        0.02       99.99
         97 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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