Frequencies for first 10,000 rows of therpr22 variable in nhamcsopd1999 dataset :

      other |
  ther/prev |
 service #2 |
    - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,925       99.25       99.25
         35 |          1        0.01       99.26
         45 |          1        0.01       99.27
         57 |          1        0.01       99.28
         89 |          1        0.01       99.29
         93 |         68        0.68       99.97
         94 |          1        0.01       99.98
         95 |          1        0.01       99.99
         97 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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