Frequencies for first 10,000 rows of therpr2 variable in namcs2000 dataset :

      other |
  ther/prev |
 service #2 |
    - 4 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,994       99.94       99.94
       4879 |          1        0.01       99.95
       9357 |          1        0.01       99.96
       9375 |          1        0.01       99.97
       9408 |          1        0.01       99.98
       9449 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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