Frequencies for first 10,000 rows of therpr12 variable in namcs1997 dataset :

      other |
  ther/prev |
 service #1 |
    - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,023       90.23       90.23
         07 |          1        0.01       90.24
         20 |          1        0.01       90.25
         21 |          1        0.01       90.26
         37 |          2        0.02       90.28
         39 |          1        0.01       90.29
         45 |          1        0.01       90.30
         48 |          1        0.01       90.31
         77 |          1        0.01       90.32
         81 |          6        0.06       90.38
         86 |         11        0.11       90.49
         89 |         22        0.22       90.71
         90 |          2        0.02       90.73
         91 |          1        0.01       90.74
         93 |         37        0.37       91.11
         94 |        852        8.52       99.63
         95 |         12        0.12       99.75
         96 |          5        0.05       99.80
         97 |          4        0.04       99.84
         98 |          2        0.02       99.86
         99 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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