Frequencies for first 10,000 rows of therpr13 variable in nhamcsopd1998 dataset :

      other |
  ther/prev |
 service #1 |
    - 3 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      8,542       85.42       85.42
        001 |      1,458       14.58      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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