Frequencies for first 10,000 rows of thernone variable in nhamcsopd1992 dataset :

Therapeutic |
   services |
 ordered or |
 provided - |
       None |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,851       38.51       38.51
          1 |      6,149       61.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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