Frequencies for first 10,000 rows of rettxsup variable in nhamcsed2001 dataset :

   refer to |
non-physici |
         an |
  treatment |
 or support |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,915       99.15       99.15
          1 |         85        0.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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